Search engines become so popular now a days about 80% of web-site visitors come from them.Search engine is a program that searches document for specified keywords or phrases.

For Example:- If you want to know about the dentist labs in china, dentist labs, dentist products etc. just once you click on the search button and you will get the best relevant data related to your search.
Search Engine become an essential and popular way for people to find an appropriate information. Google is an ultimate market leader of the search engine industry.It is an crawler based search engine and, it is known for both providing good coverage of web pages and relevant information according to our search.
Yahoo is the second largest player in the search engine industry, it was started with a human based directory but turned into crawler based search engine in 2002.

Major Search Engines are:-

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