GIF (Graphics Interchange Format) is an 8-bit-per-pixel bitmap image format that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability.

The format uses a palette of up to 256 distinct colors from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images with continuous color, but it is well-suited for more simple images such as graphics or logos with solid areas of color.

GIF images are compressed using the LZW lossless data compression technique to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. The controversy over the patent licensing agreement between the patent proprietor, Unisys, and CompuServe in 1994 led to the development of the PNG (Portable Network Graphics) standard.