c51 gradient color

Quick answer：

C51 gradient color refers to a set of predefined color gradients commonly used in programming and web design. It consists of a list of color codes that create a smooth transition from one color to another. These gradients are often used to create visual effects or to provide a visually appealing interface. C51 gradients are named after the number of colors in the gradient. They are popular in languages like HTML/CSS for creating background gradients.