A content gap is a question your audience is asking that your site has no answer for. Every gap is traffic going to someone else, which makes finding them weirdly satisfying.
The short version
A content gap is a topic, question, or keyword that your audience is searching for but that your website does not yet cover well or at all. Closing gaps captures demand you are currently missing.
How to find content gaps
Compare your coverage with competitors
Mine related questions and People Also Ask
Map your content against the buyer journey
FAQ
Is a content gap the same as a keyword gap?
They are related. A keyword gap is about specific terms competitors rank for. A content gap is broader, covering topics and questions you have not addressed.