A search engine is a tool to retrieve information form the Internet. It is a program that searches documents (in any form pdf, doc files, html, blogs, videos etc) for specified keywords and returns the list of related links.
History of popular Web Search Engines
The very first tool used for searching on the Internet was Archie. It was developed in 1990 by Alan Emtage.
The first Web search engine were Aliweb & Web Crawler.
After that during 1994 to 1995 several search engines were launched like Infoseek, Lycos 
, AltaVista
, Excite and many more.
This time interval brought a revolution in the development of search engine and after that a number of search engines launched very frequently.
In 1996 - HotBot
, Dogpile launched
In 1998 - Google 
launched by Larry Page and Sergey Brin
Around 2001, the Google search engine rose to prominence. Its success was based in part on the concept of link popularity and PageRank.
In 1999 – AlltheWeb launched
In 2000 – Baidu launched
In 2004 - Yahoo! Search
launched by David Filo and Jerry Yang
In 2005 - MSN Search now live search, Ask.com 
launched
In 2006 - Live Search launched
In 2007 – wikiseek launched
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