Gateway -- a tool for translating information across incompatible networks that use different protocols.

Gigabit -- one billion bits, usually represented as bits per second (Gbps).

Graphical Interchange Format (GIF) -- a common format for image files, especially suitable for images containing large areas of the same color. GIF format files of simple images are often smaller than the same file would be if stored in JPEG format, but GIF format does not store photographic images as well as JPEG.