Search Engines are a collection of web servers and softwares, which are used to explore information on the World Wide Web. The World Wide Web (WWW) is like an ocean of WebPages, so fishing out a particular web page containing particular information is a daunting task. Search engines simplify this task for a user. The search engine builds a huge index of web pages with the help of search engine robots. Using certain algorithm, the engines sort the index and locate 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.
Google’s path to success
One of the world’s first search tools was “Archie”, which was by created in the year 1990. Archie provided a mere reference to websites and did not index the contents of the website. After Archie, “Wandex”, the world’s first webrobot was launched which did a fantastic job in crawling the World Wide Web. Many other search engines like Aliweb, Jumpstation, Lycos, Excite, Infoseek, Inktomi, Altavista, Yahoo etc followed. But, Google, which was launched in the year 1998 won the hearts of people. Google revolutionized the way people search the web. Google uses an algorithm based on a mathematical formula known as “Pagerank” which rank websites based on the popularity of backlinks. Until now, Google has succeeded in providing its users with the most relevant search results matching the search query.
How Search Engines Work
Search Engines uses huge servers for storing large web index databases. The web index is preserved with the help of softwares 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 softwares for sorting and searching results based on the user query. The user types in search query in the query box and presses enter; then the search engines presents the user with every relevant document based on the search query within the index maintained by the search engines.
Some of the popular search engines are Google, Yahoo, Bing, Yandex, Baidu, Ask, All, The Web, Altavista, Lycos, AOL search, Guru etc.