Gateway: Hardware or software set up to translate between two different protocols. For example, Prodigy has a gateway that translates between its internal email format and Internet email format. Another definition of gateway is any mechanism for providing access to another system. For example, AOL might be called a gateway to the Internet.

GIF: (Graphics Interchange Format) - A graphics file format commonly used on the Internet to provide images on Web pages. GIF images are 8-bit (256-color) graphics.

Gigabyte: A thousand (technically 2^10 or 1024) Megabytes.

Gopher: A searching tool that was once the primary tool for finding information on the Internet before the WWW became popular. Gopher is now buried under massive amounts of WWW pages.