Tuesday, June 5, 2012

Search Engines

Search Engines are a collective combination of web servers and software which are used to search information on the World Wide Web. The World Wide Web is like a universe of WebPages and to find a particular web page or WebPages containing particular information is a daunting task. This sophisticated task is performed by the search engines which eases the task of a user in finding information. The search engine builds a massive index of web pages collected with the help of search engine robots. With the help of an algorithm, the engines sort the index and finds relevant web pages matching the search query. You would be amazed to hear but it is true that Google serves billions of search queries per day.

Earlier Search Engines

One of the world’s first search tool was “Archie” created in the year 1990 by Alan Emtage, Bill Heelan and J.Peter Deutsh .  It provided a mere reference to websites and did not indexed the contents of the site. After Archie the world’s first webrobotWandex” was launched which ultimately did a fantastic job in crawling the world wide web. After this, many search engines were launched one after another like Aliweb, Jumpstation, Lycos, Excite, Infoseek, Inktomi, Altavista, Yahoo etc. But, the search engine which won people’s heart was Google. It was launched in the year 1998 by two Stanford University Graduates Larry Page and Sergey Brin. Google revolutionized the way people search the web. Larry Page created an algorithm based on a mathematical formula known as “Pagerank” which ranked websites according to the popularity of backlinks which linked to them. This ranking of websites based on relevancy and popularity based on Pagerank started giving excellent search results. Until now, Google has succeeded in providing its users with the most relevant search results matching the search query. 

How Do Search Engines Work?

Search Engines maintain huge servers for storing large databases of web index. The web index is maintained with the help of software known as robots. These robots wander the web and crawl each and every hyperlink present on the document. Apart from crawlers, search engines have various other software for sorting and searching results based on the user query. The user enters search query in the query box and presses enter; then the search engines presents the user with the most relevant document based on the search query within the index maintained by the search engines.

For a more detailed explanation , please visit:- How do search engines work?

List of Search Engines

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