A search engine is a program that searches/identify items in a database which corresponds to keywords specified by the user. A meta search engine is an online information retrieval tool that uses data of a web (search English) and that makes its own results. A subject directory is a service which offers a collection of links to the internet which is posted by creators. Hope this helped!
Who is, that's the way they are using it
<span>For the first time in decades, Baby Boomers have been outnumbered by another group—the Millennials.</span>
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