Although they’re often used interchangeably, a web search engine is different than aweb directoryand aweb online window.
They follow a site’s links to other pages and index the information in the process.
This file contains a listing of which pages on the site a search engine should crawl.

This is one way website owners can block a search engine from indexing a particular page.
Many search engines include extra features beyond just a simple search box.
Search engines don’t search the entire web.

However, for a variety of reasons, a search engine might not have crawled a particular web page.
Google’s URL Inspection tool is one example.
This is usually done by targeting particular, but still relevant, keywords or phrases.
Just enter something there to see the results.
Technically, a search engine is a tool that searches through something else.