black and gray

Quick answer：

Black and gray are two colors that are often used together in various contexts. Black is a color that is perceived as the absence of light, while gray is a shade between black and white. In art and design, black and gray are used to convey depth, contrast, and a sense of sophistication. In technology, black and gray are often used to refer to shades of gray scale, which is a range of grays used in digital imaging.