Dofollow vs Nofollow Backlinks: What Is the Difference?
Dofollow is shorthand for a normal backlink, while nofollow is an explicit rel value. Learn how nofollow, sponsored and UGC links differ …
Wiki
Glossary pages, entity hubs, and SEO playbooks.
What Is a Referring Domain? Referring Domains vs Backlinks
A referring domain is an external website that contains at least one backlink pointing to your website. Learn how domains differ from …
What Is a Backlink? Types, Quality Signals and How to Check Them
A backlink is a link from a page on one website to a page on another website. Learn how backlink types, referring …
What Is a 403 Forbidden Error and How Do You Fix It?
A 403 Forbidden error means the server understood the request but refuses to process it. The restriction may come from file permissions, …
What Is a 408 Request Timeout Error and How Do You Fix It?
Learn what a 408 Request Timeout means, why servers close slow or idle connections, how it affects crawling and SEO, and how …
What Is a 429 Too Many Requests Error and How Do You Fix It?
A 429 Too Many Requests error means that a client exceeded a server’s request limit during a defined period. The response may …
What Is a 504 Gateway Timeout? Causes and SEO Impact
A 504 Gateway Timeout means that a server acting as a gateway or proxy did not receive a timely response from an …
What Is a 502 Bad Gateway Error? Causes and SEO Impact
A 502 Bad Gateway error means that a server acting as a gateway or proxy received an invalid response from an upstream …
What Is a 503 Service Unavailable Error? SEO & Retry-After
A 503 Service Unavailable response means that the server is temporarily unable to handle a request, commonly because of maintenance, overload or …
What Is a 500 Internal Server Error? Causes and SEO Impact
A 500 Internal Server Error means that the server encountered an unexpected condition and could not complete the request. The status identifies …
What Is a Soft 404? Causes, Detection and SEO Fixes
A soft 404 is a URL that appears to contain no valid resource but returns a successful or misleading HTTP response instead …
What Is a 410 Gone Status? 410 vs 404 Explained
A 410 Gone response means that a resource is no longer available at the requested URL and that its removal is expected …
What Is a 404 Error? 404 Not Found Explained
A 404 error is an HTTP response indicating that the server could not find the requested resource. A valid 404 is appropriate …
What Is a 302 Redirect? Temporary Redirects Explained
A 302 redirect is an HTTP response that temporarily sends users and crawlers from one URL to another. It is appropriate when …
What Is a 301 Redirect? Permanent Redirects Explained
A 301 redirect is an HTTP response that permanently sends users and crawlers from one URL to another. It is appropriate when …
What Is a Meta Robots Tag? noindex, nofollow Explained
A meta robots tag is an HTML element that tells supported search crawlers how a page may be indexed and presented in …
What Is Crawl Depth in SEO? Levels, Impact and Examples
Crawl depth in SEO is the minimum number of observed link or crawl transitions required to reach a URL from a defined …
What Is a Crawl Path in SEO? Routes, Depth and Examples
A crawl path in SEO is an observed sequence of crawlable links or transitions through which a crawler moves from a known …
What Is Crawlability in SEO? Access, Rules and Testing
Crawlability in SEO is the ability of a specified search crawler to discover or receive a URL, reach its host, obtain permission …
How Do Search Engines Discover URLs? Links, Sitemaps & More
Search engines discover URLs by extracting addresses from resources they already know and by receiving URLs through supported discovery systems such as …