Image: Electronic representation of a document, stored and displayed as a bitmap. Various compression techniquest are in use to minimize file size and network load.

Imaging: Term commonly used to describe both the products and industry dealing with images.

Index Color: Reduced Color mapping, 8 bit or less. Done to reduce images to their smallest size.

"Jaggies": Slang term for the stair-stepped appearance of a curved or angled line in digital imaging. The smaller the pixels, and the greater their number the less apparent the "jaggies". Also known as pixelization.