Glossary
Master the definitions and examples of terms related to digital marketing, data analytics, product management, and software engineering here!
A
- Ad Impressions: Definition, Impact, and Guide to Implement It
Ad impressions measure how often your ad is displayed
- Alt Text: Definition, Impact on SEO and How to Implement
Alt text is a text alternative for images
- AMP: Definition, Its Importance, and the Best Way to Implement
AMP is a useful for enhancing mobile web performance
- Anchor Text: Definition, Its Importance, and Ways to Implement
Anchor text is clickable text in a hyperlink
- Article Spinning: Definition, Impact, and How to Implement
Article spinning is rewriting content for multiple platform versions
- Article Syndication: Definition, Impact, and Ways to Implement
Article syndication republishes content to expand reach and engagement.
B
- Backlink In SEO: Definition, Importance, and How to Optimize It
A backlink is a link that directs to your website from another site.
- Bing Webmaster Tools: Definition, Its Importance and How to Implement
Bing Webmaster Tools is a free platform to help website performance in Bing search results
- Bingbot: Definition, The Importance, and How to Optimize It
Bingbot is a web crawler or a bot used by Bing’s search engine
- Black Hat: Definition, Its Impact, and How to Avoid
Excerpt: Black hat in SEO is unethical, unsustainable optimization.
- Bounce Rate: Definition, Impact, and Optimization Tips
Bounce rate measures visitors leaving without further interaction
- Branded Content: Definition, Importance in SEO, and Best Ways to Optimize It
Branded content is a strategy to build connections through meaningful narratives with audiences
- Breadcrumb Navigation: Definition, The Importance, and How to Implement It
Breadcrumb navigation shows the trail of pages in hierarchy.
- Bridge Page: Definition, Its Impact and How to Implement It
Bridge page is an SEO intermediary designed to redirect users, risky strategy
- Broken Link: Definition, Impact, and How to Solve It
A broken link is a non-functional hyperlink
G
- Google Data Studio: Definition, Its Importance, and How to Implement It Into SEO
Google Data Studio is a tool that transforms data into interactive reports
- Google Search Console: Definition, Its Importance, and How to Implement
Google Search Console is a tool for monitoring search performance.
I
- Indexing: Definition, Its Importance, and How to Improve
Indexing directly affects how a website is discovered and displayed.
K
- Keyword Stemming: Definition, Its Importance, and How to Implement It
Keyword stemming is the process of modifying words to include variations for better visibility.
- Keyword Stuffing: Definition, Its Impact, and How to Avoid It
Keyword stuffing in SEO is excessive, unnatural keyword usage for rankings.
L
- Landing Page: Definition, The Impact and Ways to Improve
A landing page is a standalone page designed to drive specific actions
- Latent Semantic Analysis: Definition, Importance, and How to Optimize It
Latent Semantic Analysis is a natural language processing technique for semantic connections
- Latent Semantic Indexing: Definition, Its Importance, and How to Implement It
Latent Semantic Indexing in SEO is a technique analyzing keyword relationships.
- Link Reclamation: Definition, Its Importance, and How to implement It
Link reclamation in SEO is recovering lost or broken backlinks to maintain website authority.
- Link Spam: Definition, Its Impact, and How to Identify It
Link spam in SEO is the excessive use of low-quality links to boost rankings.
- Link Velocity: Definition, Its Important, and How to Build It
Link velocity in SEO is the rate at which a website gains or loses backlinks over time.
- Local Citation: Definition, Importance, and How to Build It
Local citation in SEO is online mentions of businesses.
- Local Pack: Definition, Its Importance, and How to Improve It
Local Pack is Google's top three local search results with maps.
- Local SEO: Definition, Its Impact, and How to Optimize It
Local SEO helps businesses rank in local searches.
- Long Tail Keyword: Definition, Its Importance, and How to Find It
Long-tail keyword in SEO targets niche, highly specific search phrases.
M
- Meta Description: Definition, Its Impact, and How to Optimize It
A meta description is a brief summary of a webpage that appears in search results.
- Meta Keywords: Definition, Its Impact, and How to Optimize It
Meta keywords are HTML tags that define relevant keywords to describe a webpage’s content.
- Meta Robots: Definition, Its Impact, and How to Optimize It
Meta robots are HTML tags that guide search engines on indexing and crawling web pages efficiently.
- Meta Tags: Definition, Its Importance, and How to Optimize It
Meta tags in SEO are snippets of code that provide search engines with page information.
- Meta Title: Definition, Its Importance, and How to Implement It
A meta title is an HTML element that defines a webpage’s title for search engines and users.
- Mirror Site: Definition, Its Importance, and How to Build It
Mirror site is a duplicate website hosted on a different server to improve performance
- Mobile SEO: Definition, Its Importance, and How to Implement It
Mobile SEO optimizes websites for better mobile search rankings.
N
- NAP: Definition, Its Importance, and How to Optimize It
NAP in SEO means business name, address, phone.
- Natural Language Processing: Definition, Its Impact, and How to Implement It
Natural language processing enhances SEO by improving search accuracy and relevance
- Natural Links: Definition, Its Importance, and How to Build It
Natural link is an organic backlink earned without manipulation
- Navigational Intent: Definition, Its Impact, and How to Identify It
Navigational intent is when users search for a specific website.
- Navigational Query: Definition, Its Impact, How to Identify It
A navigational query is a search to find a specific website
- Negative Keyword: Definition, Its Importance, and How to Identify It
Negative keyword is a PPC term that blocks ads from irrelevant searches.
- Negative SEO Attack: Definition, Its Impact, and How to Identify It
Negative SEO attack is an attempt to harm a website’s rankings.
- NLU: Definition, Its Impact, and How to Optimize Content for It
NLU is AI that enables machines to understand human language
- Nofollow: Definition, Its Importance, and How to Identify It
Nofollow is an attribute that blocks link following
- Noindex Tag: Definition, Its Importance, and How to Implement It
The noindex tag is a directive preventing indexing
- Noopener: Definition, Its Importance, and How to Implement It
Noopener is an HTML attribute that improves link security
- Noreferrer: Definition, Its Importance, and How to Implement It
Noreferrer is an attribute that prevents sending the HTTP referrer header
O
- Off-Page SEO: Definition, Its Impact, and How to Implement
Off-page SEO refers to external strategies improving rankings.
- On-Page SEO: Definition, Its Importance, and How to Improve
On-page SEO optimizes website content and structure for better rankings.
- Open Graph Meta Tags: Definition, Its Importance, and How to Implement It
Open Graph meta tags define how content appears on social media platforms
- Organic Search: Definition, Its Importance, and How to Improve Its Rankings
Organic search in SEO refers to unpaid search engine results
- Orphan Page: Definition, Its Impact, and How to Fix It
An orphan page is a page without internal links
- Outbound Link: Definition, Its Importance, and How to Implement It
An outbound link is a hyperlink that takes users from your site to another.
P
- Page Authority: Definition, Its Importance, and How to Build It
Page authority predicts a webpage's SERP ranking potential
- Page Speed: Definition, Its Importance, and How to Improve It
Page speed measures how quickly webpage content loads and becomes accessible
- Paid Search: Definition, Its Impact, and How to Optimize It
Paid search lets businesses pay for ad spots on SERPs
- PBN: Definition, Its Impact, and How to Avoid Relying on It
Private Blog Network manipulates search engine rankings
- People Also Ask: Definition, Its Impact, and How to Optimize Content for It
People Also Ask displays related questions in Google search results for users
- Pillar Page: Definition, Its Importance, and How to Build It
A pillar page is a central SEO page linking related subtopics
- Pogo Sticking: Definition, Its Impact, and How to Overcome It
Pogo sticking occurs when a user returns to the search results after visiting a page.
- Primary Keywords: Definition, Its Importance, and How to Identify It
Primary keywords are the search terms that represent the topic of a webpage
R
- RankBrain: Definition, Its Impact, and How to Optimize Content for It
RankBrain is Google's AI in Hummingbird algorithm
- Reciprocal Link: Definition, Its Impact, and How to Naturally Implement It
A reciprocal link is a mutual website link exchange
- Referral Traffic: Definition, Its Impact, and How to Improve It
Referral traffic comes through links from other websites
- Related Searches: Definition, Its Impact, and How to Optimize It
Related searches are queries suggested by search engines at the bottom
- Relative URL: Definition, Its Importance, and How to Optimize It
A relative URL points to resources relative to the current location.
- Rich Snippet: Definition, Its Impact, and How to Implement It
Rich snippet is a search result that includes additional details about a webpage
- Robots.txt: Definition, Its Importance, and How to Optimize It
Robots.txt directs crawlers on interacting with website content.
- RSS Feed: Definition, Its Impact, and How to Implement It
RSS feed stands for Really Simple Syndication, distributing updated content like blogs or videos
S
- Schema Markup: Definition, Its Impact, and How to Implement It
Schema markup is structured data providing content context
- Search Intent: Definition, Its Importance, and How to Identify It
Search intent is the purpose behind a user's query
- Search Results: Definition, Its Impact, and How to Optimize It
Search results are valuable listings on search engine results pages
- Search Term: Definition, Its Impact, and How to Optimize Your Content for It
A search term is a user's query
- Search Visibility: Definition, Its Importance, and How to Optimize for Better Search Visibility
Search visibility measures a website's content exposure in SERPs
- Search Volume: Definition, Its Importance, and How to Find It
Search volume measures how often a keyword is searched
- Secondary Keywords: Definition, Its Importance, and How to Identify It
Secondary keywords add depth to primary keywords
- Seed Keywords: Definition, Its Importance, and How to Identify It
Understanding seed keywords is crucial for long-term SEO success
- Semantic Search: Definition, Its Impact, and How to Optimize It
Semantic search understands user intent, beyond keywords
- SEO Plugin: Definition, Its Importance, and How to Implement It
SEO plugins simplify website optimization for search engines
- SEO Silo: Definition, Its Impact, and How to Implement It
An SEO silo organizes content into topic-specific categories
- SEO-Friendly URL: Definition, Its Importance, and How to Build It
SEO-Friendly URL is a structured and readable web address
- SERP: Definition, Its Impact, and How to Optimize Its Features
SERP is the page displaying search results from search engines
- Short-Tail Keywords: Definition, Its Importance, and How to Identify It
Short-tail keywords are broad, high-traffic terms that cover general topics in SEO strategies
- Site Speed: Definition, Its Importance, and How to Improve It
Site speed measures how fast a website loads and becomes interactive
- Sitelinks: Definition, Its Importance, and How to Optimize It
Sitelinks show extra links below a website’s main result.
- Sitemap: Definition, Its Importance, and How to Implement It
A sitemap lists URLs with metadata for search engines
- Spam Score: Definition, Its Impact and How to Improve It
Spam score measures a website's penalty risk
- Subdomain: Definition, Its Importance, and How to Optimize It
Subdomains divide content into segments, treated separately by search engines
T
- Taxonomy: Definition, Its Importance, and How to Implement It
Taxonomy organizes content for better navigation and visibility
- Technical SEO: Definition, Its Importance, and How to Optimize
Technical SEO optimizes website infrastructure for better search visibility
- TF-IDF: Definition, What’s the Importance, and How to Calculate
TF-IDF links keyword research with content optimization.
- Thin Content: Definition, Its Impact, and How to Avoid It
Thin content offers little value to users
- Tiered Link Building: Definition, Its Importance, and How to Implement It
Tiered link building strengthens SEO through layered backlink structures
- Topical Authority: Definition, Its Importance, and How to Build It
Topical authority builds expertise through comprehensive, interconnected content
- Topical Relevance: Definition, Its Importance, and How to Build It
Topical relevance measures how well content matches user search intent
- Transactional Intent: Definition, Its Importance, and How to Identify
Transactional intent in SEO is when users are ready to act
- TrustRank: Definition, Its Importance, and How to Optimize It
TrustRank helps search engines assess credibility based on backlinks
U
- UGC Link Attribute: Definition, Its Importance, and How to Identify Links That Require It
The UGC attribute enhances transparency and prevents SEO penalties.
- Universal Search: Definition, Its Impact, and Ways to Implement the Best Practices
Universal search integrates various content types into search results.
- Unnatural Links: Definition, Its Impact, and How to Solve This Problem
Unnatural links manipulate rankings, violating search engine guidelines and user value
- URL Rating: Definition, Its Importance, and How to Improve It
URL rating is a metric for assessing the link authority of a webpage.
- URL Slug: Definition, Its Importance, and the Right Way to Implement It
A URL slug is the specific page address
- User Intent: Definition, Its Importance, and How to Identify It
User intent is about finding out why someone is searching a query
V
- Vertical Search: Definition, Importance, and Best Ways to Implement
Vertical search targets specific niches for tailored results.
- Voice Search: Definition, Its Impact, and How to Implement It
Voice search processes spoken queries to return relevant results
W
- Web Crawler: Definition, Its Importance, and How to Help Optimize It
Web crawler is a program gathering website data
- Website Compliance: Definition, The Importance, and How to Implement It
Website compliance is ensuring legal, ethical, and technical standards.
- Website Hit: Definition, Its Importance, and How to Improve It
A website hit is a server file request
- Webspam: Definition, Its Impact, and How to Avoid It
Webspam manipulates search rankings, showcasing SEO's dark side
- What Is CDN in SEO: Definition, Its Impact, and How to Implement It
CDN is a Content Delivery Network that distributes website content across multiple servers globally.
- What Is Click Depth in SEO: Definition, Its Importance, and How to Optimize It
Click depth in SEO is the number of clicks it takes to reach a page from the homepage.
- What Is Cloaking in SEO: Definition, Its Impact, and How to Avoid It
Cloaking in SEO is showing different content to search engines than to human visitors.
- What Is Co-Citation in SEO: Definition, Its Importance, and How to Implement It
Co-citation is when two websites are mentioned together by a third site without linking.
- What Is Commercial Intent in SEO: Definition, Its Importance, and How to Identify It
Commercial intent is the likelihood that a user’s search query indicates readiness to purchase.
- What Is Content Gap Analysis in SEO: Definition, Its Importance, and How to Implement It
Content gap analysis is identifying missing or underperforming content compared to competitors.
- What Is Conversion Rate Optimization in SEO: Definition, Its Impact, and How to Improve It
Conversion Rate Optimization is the process of increasing the percentage of visitors who take desired actions.
- What Is Core Web Vitals in SEO: Definition, Its Importance, and How to Improve It
Core Web Vitals are performance metrics measuring user experience elements like loading, interactivity, and stability.
- What Is Cornerstone Content in SEO: Definition, Its Importance, and How to Build It
Cornerstone content is comprehensive, authoritative content covering core topics of a website.
- What Is Crawl Budget in SEO: Definition, Its Importance, and How to Optimize It
Crawl budget is the number of pages search engines crawl on your site within a timeframe.
- What Is Crawlability in SEO: Definition, Its Importance, and How to Optimize It
Crawlability is a website’s ability to be accessed and indexed by search engine bots.
- What Is Crawler in SEO: Definition, Its Importance, and How to Optimize It
Crawler is a search engine bot that scans and indexes website content.
- What Is De-Indexed in SEO: Definition, Its Impact, and How to Recover from It
De-indexed is the removal of a webpage or website from search engine indexes.
- What Is Deep Link in SEO: Definition, Its Impact, and How to Optimize It
A deep link in SEO directs users to a specific page within a website, improving navigation.
- What Is Direct Traffic in SEO: Definition, Its Importance, and How to Improve It
Direct traffic in SEO is website visits from users entering the URL directly or using bookmarks.
- What Is Directory Links in SEO: Definition, Its Impact, and How to Optimize It
Directory links are backlinks from online directories listing businesses or websites.
- What Is Dofollow Link in SEO: Definition, Its Impact, and How to Build It
Dofollow link in SEO is a hyperlink that passes authority from one site to another.
- What Is Domain Authority in SEO: Definition, Its Importance, and How to Improve It
Domain authority is a metric predicting a website’s ability to rank in search engines.
- What Is Domain History in SEO: Definition, Its Impact, and How to Find It
Domain history is the record of a domain’s past ownership and activities.
- What Is Domain Rating in SEO: Definition, Its Importance, and How to Improve It
Domain rating in SEO is a metric measuring a website's backlink authority and strength.
- What Is Domain Structure in SEO: Definition, Its Impact, and How to Optimize It
Domain structure in SEO is the arrangement of a website’s domain, subdomains, and URLs.
- What is Doorway Page in SEO: Definition, Its Impact, and How to Avoid it
A doorway page in SEO is a low-quality page designed solely to manipulate search rankings.
- What is Duplicate Content in SEO: Definition, Its Importance, and How to Implement It
Duplicate content is identical or similar content appearing on multiple web pages, impacting SEO rankings.
- What Is Dwell Time in SEO: Definition, Its Importance, and How to Improve It
Dwell time in SEO is the duration a user stays on a webpage before returning to search results.
- What is Dynamic Content in SEO: Definition, Its Importance, and How Implement It
Dynamic content in SEO is website content that changes based on user behavior or data.
- What is Dynamic URL in SEO: Definition, Its Importance, and How to Optimize It
Dynamic URL in SEO is a web address with parameters that change based on user input.
- What Is Editorial Link in SEO: Definition, Its Importance, and How to Build It
Editorial link in SEO is a natural backlink earned through high-quality content.
- What Is EEAT in SEO: Definition, Its Impact, and How to Improve It
EEAT in SEO is Expertise, Experience, Authoritativeness, and Trustworthiness for content quality.
- What is Entity-Based SEO in SEO: Definition, Its Importance, and How to Implement It
Entity-based in SEO is optimizing for concepts, not just keywords, using structured data.
- What is Entry Page in SEO: Definition. Its Impact, and How to Optimize It
Entry page in SEO is the first webpage a visitor lands on from search.
- What Is Evergreen Content in SEO: Definition, Its Importance, and How to Create It
Evergreen content in SEO is timeless, valuable content that remains relevant long-term.
- What is External Link in SEO: Definition, Its Importance, and How to Optimize It
An external link in SEO is a hyperlink from one website to another, improving credibility and authority.
- What is Featured Image in SEO: Definition, Its Impact, and How to Optimize It
Featured image in SEO is the primary visual representing a webpage or article.
- What is Featured Snippet in SEO: Definition, Its Impact, and How to Optimize for It
Featured snippet in SEO is a highlighted search result providing quick answers.
- What is Footer Link in SEO: Definition, Its Impact, and How to Implement It
Footer link in SEO is a hyperlink placed in a website’s footer section.
- What is Gateway Page in SEO: Definition, Its Impact, and How to Fix it
Gateway page in SEO is a low-value page designed to manipulate rankings.
- What is Geotagging in SEO: Definition, Its Importance, and How to Implement It
Geotagging in SEO is adding location metadata to digital content for relevance.
- What is Global SEO in SEO: Definition, Its Impact, and How to Optimize It
Global SEO in SEO is optimizing websites for international audiences and search engines.
- What is GMB in SEO: Definition, Its Impact, and How to Optimize It
GMB in SEO is Google My Business, a tool for local listings.
- What is Google Autocomplete in SEO: Definition, Its Impact, and How to Optimize It
Google Autocomplete in SEO is a feature predicting search queries based on trends.
- What is Google Bombing in SEO: Definition, Its Impact, and How to Recover from It
Google Bombing in SEO is manipulating search rankings using mass anchor text links.
- What is Google Dance in SEO: Definition, Its Impact, and How to Optimize It
Google Dance in SEO refers to temporary ranking fluctuations by algorithm updates, indexing, and competition.
- What is Google Hummingbird in SEO: Definition, Its Importance, and How to Improve it
Google Hummingbird is a search algorithm update that improves query understanding.
- What is Google Knowledge Panel in SEO: Definition, Its Importance, and How to Optimize It
Google Knowledge Panel in SEO is an information box displaying key entity details.
- What is Google Panda in SEO: Definition, Its Impact, and How to Recover from It
Google Panda in SEO is an algorithm update targeting low-quality content.
- What is Google Penalty in SEO: Definition, Its Impact, and How to Avoid It
Google penalty in SEO is a ranking drop due to policy violations.
- What is Google Penguin in SEO: Definition, Its Impact, and How to Overcome It
Google Penguin in SEO is an algorithm update targeting manipulative link practices.
- What is Google Pigeon in SEO: Definition, Its Importance, and How to Implement it
Google Pigeon is an algorithm update that improves local search accuracy by refining ranking factors.
- What is Google Sandbox in SEO: Definition, Its Impact, and How to Optimize It
Google Sandbox in SEO is a filter that temporarily limits new websites from ranking highly.
- What Is Google Shopping in SEO: Definition, Its Importance, and How to Implement It
Google Shopping in SEO is a platform that displays product listings in Google search results.
- What Is Google Tag Manager in SEO: Definition, Its Importance, and How to Implement It
Google Tag Manager is a tool that simplifies tracking, tag management, and analytics for SEO efficiency.
- What Is Grey Hat SEO in SEO: Definition, Its Impact, and How to Avoid It
Grey hat SEO in SEO is using tactics between white and black hat.
- What Is Guest Post in SEO: Definition, Its Importance, and How to Build It
Guest post in SEO is publishing content on other websites for backlinks.
- What is H1 in SEO: Definition, Its Importance, and How to Optimize It
H1 in SEO is the main heading that defines content structure.
- What is Header Tags in SEO: Definition, Its Importance, and How to Optimize It
Header tags in SEO structure content and improve readability for rankings.
- What Is Hidden Text in SEO: Definition, Its Impact, and How to Identify It
Hidden text in SEO is invisible content used to manipulate rankings.
- What is Hilltop Algorithm in SEO: Definition, Its Importance, and How to Implement It
Hilltop Algorithm in SEO identifies authoritative pages to improve search rankings.
- What is Holistic SEO in SEO: Definition, Its Impact, and How to Implement It
Holistic SEO is a comprehensive approach optimizing technical, content, and UX.
- What Is Hreflang in SEO: Definition, Its Importance, and How to Implement It
Hreflang is an HTML tag that helps search engines show the right language or regional page to users.
- What is Inbound Link in SEO: Definition, Its Importance, and How to Build It
An inbound link is a backlink from another website.
- What is Index Bloat in SEO: Definition, Its Impact, and How to Fix It
Index bloat in SEO is excessive, unnecessary pages in search indexes.
- What is Indexability in SEO: Definition, Its Importance, and How to Improve It
Indexability in SEO means search engines can index pages efficiently.
- What is Informational Intent in SEO: Definition, Its Impact, and How to Identify It
Informational intent refers to searches seeking knowledge, answers, or explanations.
- What is Informational Queries in SEO: Definition, Its Importance, and How to Identify It
Informational queries in SEO are searches for knowledge, not transactions.
- What is Internal Link in SEO: Definition, Its Importance, and How to Optimize It
An internal link in SEO connects website pages together.
- What is JavaScript SEO in SEO: Definition, Its Importance, and How to Optimize It
JavaScript SEO in SEO ensures search engines properly index JavaScript.
- What is Keyword Cannibalization in SEO: Definition, Its Impact, and How to Fix It
Keyword cannibalization in SEO is competing pages lowering rankings.
- What is Keyword Clustering in SEO: Definition, Its Impact, and How to Implement It
Grouping related keywords to improve SEO and rankings.
- What is Keyword Density in SEO: Definition, Its Importance, and How to Optimize It
Keyword density in SEO is the percentage of keyword usage.
- What is Keyword Difficulty in SEO: Definition, Its Importance, and How to Calculate It
Keyword difficulty in SEO measures how hard ranking for keywords is.
- What is Keyword Research in SEO: Definition, Its Importance, and How to Optimize It
Keyword research in SEO is finding relevant search terms.
- What is Link Bait in SEO: Definition, Its Impact, and How to Implement It
Link bait is high-quality, shareable content designed to attract organic backlinks and boost SEO rankings.
- What is Link Building in SEO: Definition, Its Importance, and How to Optimize It
Link building is acquiring inbound links from external sites to improve SEO, authority, and rankings.
- What is Link Equity in SEO: Definition, Its Important, How to Optimize It
Link equity is the value passed through backlinks, influencing a page’s authority and search rankings.
- What is Link Exchange in SEO: Definition, Its Impact, and How to Optimize It
Link exchange in SEO is the practice of websites mutually linking to boost rankings and authority.
- What is Link Farm in SEO: Definition, Its Impact, and How to Identify It
A link farm in SEO is a network of low-quality backlinks.
- What is Link Juice in SEO: Definition, Its Importance, and How to Optimize it
Link juice is the SEO value passed through backlinks, influencing rankings and website authority.
- What is Link Popularity in SEO: Definition, Its Impact, and How to Optimize it
Link popularity measures the quantity and quality of backlinks pointing to a website for SEO.
- What is Link Rot in SEO? Is It Dangerous?
Link rot occurs when websites experience broken links or inaccessible resources.
- White Hat: Definition, Its Importance, and Best Ways to Implement
White Hat SEO is key to ethical marketing
X
- X-Robots-Tag: Definition, Impact, and Correct Implementation
The X-Robots-Tag controls search engine crawlers' access
