In generic terms, a search engine is a computer program that searches and identifies the objects in a database that are most relevant to the keyword the user has searched for. In World Wide Web, search engines are portals where internet users make searches to find or learn about almost anything. Google, Yahoo, Bing, and Baidu are the most popular search engines on the World Wide Web. The search tool of an ecommerce store, a website, or within an offline system is also a search engine.
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