Color gradient image from red to blue

Quick answer：

A color gradient image is a visual representation where the colors gradually transition from one color to another. In the case of a red to blue gradient, the image would start with shades of red at one end and gradually shift through various hues of purple and eventually end with shades of blue at the other end. This type of gradient is commonly used in design, art, and data visualization to represent a range of values, such as temperature or time.