GIF (Graphics Interchange Format)
GIF is one of the two most popular image formats used on the Internet. It supports up to 8-bit colour depth images, i.e. 256 colours. (see JPG)

GIF89a
The same format as GIF, but supports animation and single colour transparency.

GIF87a
The earlier version of the GIF format which does not support transparency or animation.

HTML (HyperText Markup Language)
HTML is a collection of commands, called Tags, integrated into plain text documents that can be interpreted by Web browsers.

Interlace
An Interlaced GIF is displayed incrementally in several passes, and detail is added each time. Depending on which graphics viewer or Web browser is being used, interlaced GIFs may produce a "venetian blind" effect or simply a blurry or blocky image that gradually sharpens. (see GIF & Noninterlaced)

ISP (Internet Service Provider)
A company that provides access to the Internet. Before you can connect to the Internet you must first establish an account with an Internet Service Provider. For a monthly or yearly charge the service provider will give you a username, password and an access phone number.