A hashtag is a keyword or phrase used to identify a topic and is preceded by a hash or pound sign (#). For example, the hashtag #sandiegofire helped coordinate emergency responses to a fire.

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A hashtag is indeed a keyword or phrase preceded by a hash sign (#) and is used on social media platforms to tag and facilitate search for topics or content related to that keyword or phrase.

A Hashtag Is a Keyword or Phrase Used to Identify