When should you use a metasearch engine?
You should use a metasearch engine if you need more results than you would from a regular search engine. You can also use certain metasearch engines like Ixquick or StartPage if you are concerned with privacy. Metasearch engines are usually not search engines themselves. They redirect traffic to actual search engines and then return the results. That can help privacy since the largest search engines record the details of your search. If you use a metasearch engine, then all the large search engines would have is that the metasearch engine performed a search on their sites using whatever terms at whatever time. If the metasearch engine doesn't record your search details, then it would be harder to trace the search back to you.
New popular metasearch engine http://www.tripleme.com which fetches from MSN, Yahoo, Google and displays results on one screen in multi columns side by side. Supports local and global search, all languages, all results, spelling suggestions, duplication links removing option. Also, you can compare performance of different search engines.
Generally speaking, meta search engines perform searches using a conglomeration of other search engines. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously. Metasearch engines operate on the premise that the Web is too large for any one search engine to index it all and that more comprehensive search results can be obtained by combining the results from several search engines. This also may save the user from having…
A meta-search engine is a search tool that sends user requests to several other search engines and/or databases and aggregates the results into a single list or displays them according to their source. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously.