Short version: A content brief is a clear assignment that explains what a piece of content should achieve, include, avoid, and deliver.
It can define the audience, goal, format, angle, key message, proof points, SEO intent, visual direction, tone of voice, required assets, and review rules. A good brief gives enough structure without writing the final piece for the creator.
Content briefs reduce wasted revisions because everyone knows what the output is supposed to do. They are useful for blog articles, social posts, landing pages, videos, emails, case studies, and creator collaborations.
In practice, a brief should make the creator faster and more accurate, while still leaving room for strong judgment, examples, and a natural final voice.
Related terms: Creator brief, Content strategy, and Copywriting.