Three sets of gradient colors

Quick answer：

Gradient colors refer to a gradual transition between two or more colors. In the context of design, they are often used to create a smooth, seamless blend from one color to another. This technique can be applied to various media such as digital art, web design, and graphic design. In the case of 'three sets of gradient colors,' it suggests the use of three distinct gradients, each with its own color scheme or transition pattern.