What is a design brief?

A design brief is a written document for a design project developed in concert by a person representing the business need for design and the designer. The document is focused on the desired results of design - not aesthetics. Design briefs are commonly used in consulting engagements, when an independent designer or a design agency executes a design on behalf of a client. They are less common when the designer is in-house.
A design brief lists all the requirements for a specific project