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A search engine is a software system designed to search for information on the World Wide Web. The search results are generally presented in a line of results, often referred to as search engine results pages (SERPs). The information may be a mix of web pages, images, videos, infographics, and other types of files. Search engines are utilized by millions of people daily through search engines such as Google, Bing, and Yahoo.

Search engines use different algorithms to crawl, index, and rank web pages. Web crawlers, also known as spiders or robots, are automated programs that systematically browse the web and collect information about web pages. This information is then stored in a search engine's index, a large database that organizes information for quick retrieval. When a user enters a query into a search engine, the search engine's algorithm processes the query and retrieves relevant results from its index.

Search engines can be categorized into two main types: general-purpose search engines and vertical search engines. General-purpose search engines, like Google, aim to index and provide results for a wide range of topics. Vertical search engines, on the other hand, focus on specific types of content, such as images, videos, or academic papers.

Search engines play a crucial role in the modern digital landscape, enabling users to access vast amounts of information quickly and efficiently. They have become an integral part of our daily lives, influencing how we communicate, learn, and conduct business.