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The tags placed in the <head> element to provide meta information about the document are called meta-tags.

Meta tags are tags placed in the <head> element to provide meta information about the document being served. They are not supposed to be directly seen by page visitor; they help browsers to properly display the page, and search engines to index it.

Important part of the family are <meta http-equiv="..."> tags, that provide equivalents for HTTP Headers when it's impossible to send HTTP headers due to server's configuration.

Other common attributes are keywords, description, language and robots.

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