The Double Diamond is a graphic representation of a creative process, such as a design sprint, that helps you understand and respond to the needs of your users.
The official Double Diamond design model has four stages: Discovery, Definition, Development and Delivery. These stages, when combined, serve as a road map for organizing your thoughts in order to better the creative process.
You can read the article below for a more in-depth look at the double diamond model and how to implement it.