What is search engine ?

Search engine optimization (SEO) is the process of changing the position of a website or a web page in a search engine's search results (Organic or Natural results).
 
Search engine is a when you input a keyword then this keyword related information provide by search engine.
 
Search engine in simple terms means web-based tool that enables users to locate information on the World Wide Web by typing the desired keyword.
For example -If you type Black Leather Shoes in search engine .The search engine would help display all the top websites which sell Black leather shoes.
That's what search engine does.Helps you to find what you need.
 
Search engines are programs that search documents for specified keywords and returns a list of the documents where the keywords were found. A search engine is really a general class of programs, however, the term is often used to specifically describe systems like Google, Bing and Yahoo! Search that enable users to search for documents on the World Wide Web.
 
a program that searches for and identifies items in a database that correspond to keywords or characters specified by the user, used especially for finding particular sites on the World Wide Web
 
A web search engine is a software system that is 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, and other types of files. Some search engines also mine data available in databases or open directories. Unlike web directories, which are maintained only by human editors, search engines also maintain real-time information by running an algorithm on a web crawler.
 
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