A gradient is a graduated blend between two or more colors or between two tints of the same color. The output device you use affects how gradients color separate.
Gradients can include Paper, process colors, spot colors, or mixed ink colors using any color mode. Gradients are defined by a series of color stops in the gradient bar. A stop is the point at which a gradient changes from one color to the next, and is identified by a color square under the gradient bar. By default, a gradient starts with two colors and a midpoint at 50%.