search engine

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what is a benifit of search engine. what is benifit to add your site in search engine. many search engline are there yahoo,google,altra vista, and other. how site come in this search engine and how site ranking are come. most popular search engline now days. google avery budy have any problem he is find out firstly internet.it is benifit or not. any person or any company add our site url in any search engline. what type he is search a site and how to make (create), develope new search engine tall me. and tall me others benifit of search engine.