The term raster graphic says something about the way it is displayed. Raster graphics have a fixed grid divided into identical vertical and horizontal lines, forming square fields. Each square field corresponds to a pixel, which, according to a pixel graphic, represents a digital value.
In raster graphics, the display is line-by-line from left to right and image-by-image from top to bottom, always continuously. This form of display has the advantage that the repetition rate is independent of the image content and a stable, flicker-free image display is obtained by using a suitable frame repetition frequency. Raster display is the most common form of display on monitors or other displays. It can be used for all computer graphics.
Raster graphics contain only raster information and no vector data. Each pixel can be represented in black and white, in grayscale or in color. Raster graphics are memory-intensive and can be subjected to data reduction using various compression methods.