What is Meta Search Engines?

Definition of Meta Search Engines :- A search engine that returns listings from two or more search engines, instead of using its own index.

In other language these types of search engines depends on other search engines database for indexing. They are not managing his own indexing database.

Meta search engines are search tools that aggregate and consolidate results from multiple search engines and provide users with a single set of results. Instead of crawling the web themselves, meta search engines rely on existing search engines to gather results, which they then combine and present to the user in a single, unified list. This can save users time and effort by providing them with a more comprehensive set of results in a single search, and can also help users find results that might not appear in any single search engine's results. Some popular examples of meta search engines are Dogpile and MetaCrawler.