This document discusses meta search engines, which allow users to search multiple search engines at once from a single interface. It defines meta search engines, explains why they are useful since individual search engines don't index the entire web. It describes the typical architecture of a meta search engine, including the user interface, dispatcher that sends queries to different engines, and display that generates consolidated results. Finally, it covers advantages like comprehensive results and easy use, as well as disadvantages such as lots of unsorted results and obscure results missing.