Meta search engines
§Meta-search engines do not maintain databases of their own = “middle agents”
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§Transmit your search query simultaneously to multiple search engines
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§Search results represent a compilation of results from all engines queried
A meta-search engine is like a middle-man or agent that acts as a go-between between the searcher and the search engines.  Meta search engines were developed by Web-savvy people who recognized the fact that people often search several engines for one topic.  This is time consuming, plus you'll find lots of duplication among the various engines.  So, using a meta search engine saves time by searching several engines at once, eliminating duplication, and presenting the results to the user.