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what is search engine? and how many are there?

A search engine is designed to search for information on the world wide web(WWW). The search results are generally presented in a list of results and are often called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.actually there are so many search engines but i can figure a few.

Ask anyone which search engine they use to find information on the Internet and they will almost certainly reply: "Google.", and market research shows that people actually use four main search engines for 99% of their searches: Google, Yahoo!, MSN, and Ask.com.

But there are so many innovative and creative search engines you have never seen. With ChaCha, you can pose any question that you wish, click on the "Search With Guide" button, and a ChaCha Guide appears in a Chat box and dialogues with you until you find what you are looking for. There's no time limit, and no fee.

 by Charles S. Knight, SEO, and edited by Richard MacManus. The Top 100 is listed at the end of the analysis.