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Metadata is data about data. In other words, it is data that is used to describe another item's content.
The term metadata is often used in the context of Web pages, where it describes page content for a search engine.
Metadata is an important tool for improving a Web page's search engine optimization (SEO). Search engines generally use metadata, along with a combination of other factors, to determine what is on a Web page and how relevant that content is to a given search. This data is included in the the meta tags found in a Web page's HTML or XHTML.
Common metadata used by most search engines includes: