A keyword is a word or concept with special significance, in particular any word used as the key to a code or used in a reference work to link to other words or other information.

The term keyword in reference to Search Engine Marketing (SEM) usually refers to a word or keyword phrase (combination of words, such as 'Chicago Courier Service') used to find relevant and useful web pages.

It may also mean:

or a word which occurs in a text more often than we would expect to occur by chance alone

  • Keyword (search) or keyword phrase, a word or phrase to find information in either physical or electronic libraries
  • Keyword (Internet search) or keyword phrase, a word or a phrase used to find useful results in internet searches
  • Smart keyword, shortcut for bookmarks in Firefox

In a non-computer sense:

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