What is a search engine?

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A search engine, or web search engine, is software which is designed to search and retrieve information on the World Wide Web.

A search engine uses web crawling, indexing and search processes in near real-time in order to search information on the World Wide Web.

The first process used by a search engine is web crawling, whereby the search engine typically sends out a spider to go from website to website to fetch as many documents as possible. Then, via indexing, the information sent back by the spider is indexed.

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