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A search engine locates things on the Web. You type in one or more keywords and then you get a list of results where you can click on the links and check out those pages.

Search engines are simply huge databases of keywords, excerpts, and links. DNS registration data is public information, so search engines can check the DNS databases to see what sites exist and then "crawl" each of those sites and index what is there. One way is to parse all the links on a site and go to each link and parse those, and so on. So that is roughly how the term "crawling" came about, since it goes from link to link looking for text to index and more links. Also, site hosts can manually add their sites to search engines too.

If you mean a local search engine, then it just searches for things in your computer. You would use it similarly to a web search engine, but it crawls the folders and inside of files instead of sites.

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