Indexability

Indexability is the technical ability for search engines to find and include a web page in their index. Pages fail to become indexed when they're blocked by robots.txt rules, disallowed by noindex meta tags, hidden behind authentication walls, served with non-200 HTTP status codes, or inaccessible due to crawl budget constraints. A page can be indexed without ranking well, but it cannot rank at all if it isn't indexed in the first place.

For SEO practitioners, indexability is a prerequisite—the first gate before any ranking can happen. Common problems include accidentally blocking important pages from crawlers, using noindex on pages you want to rank, or having redirect chains and soft 404s that confuse crawlers about what should be indexed. Auditing indexability means checking your crawl budget consumption, verifying robots.txt and meta robot rules aren't over-restrictive, confirming site structure lets crawlers reach all valuable pages, and monitoring Google Search Console for crawl errors and indexation reports.