An index, or indexing, is the database used to store and retrieve information collected during the crawling process by search engines .

The index is a huge database of all the content that search have discovered and deem good enough to serve to researchers.

Indexability

The ease with which a search engine bot can understand and add a web to its index.

Indexed Page

A web page that has been discovered by a crawler, added to a search engine index, and is eligible to appear in search results for relevant queries.

Index coverage report

A report in Google Search Console that shows the indexing status of your website's pages.

Tag NoIndex

A meta tag that instructs a search engine not to index the page it is on.