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What is the underscore in Google search?

Published in Google Search Operators 2 mins read

The underscore (_) in Google search acts as a specific search operator used to prompt Google for suggested related keywords, but it comes with a unique limitation.

Understanding the Underscore (_) in Google Search

The underscore character (_) serves a particular function in Google search, helping users discover additional, relevant keywords that Google identifies as significant from a user's perspective. It's not a commonly known operator, largely due to its specific behavior.

How the Underscore Operator Works

When you use the underscore operator, it helps Google understand the relationship between two words and provides relevant keyword suggestions.

  • Placement: To utilize this operator, simply type the underscore character (_) directly between two keywords in your search query.
  • Functionality: Upon entering a query like keyword1_keyword2, Google will display a few suggested keywords. These suggestions are what Google believes to be important and related terms from the perspective of users who search for similar topics.
  • Example: For instance, searching for content_marketing might prompt suggestions related to specific strategies within content marketing or its popular sub-topics.
  • Important Limitation: A crucial characteristic of the underscore operator is that it only functions within Google Chrome's Incognito mode (or similar private browsing modes in other web browsers). It will not yield results or suggested keywords when used in a standard browsing session.

This operator is primarily useful for those looking to expand their understanding of related search terms or to find popular long-tail keywords associated with a particular two-word phrase, especially for content creation or SEO research when in private browsing mode.