Aliasing:
It is a technique usually used for displaying bitmap file. It is the process of setting pixels close to the intermediary Color where the edges cross the pixels, giving the diagonal edges smooth look.

Ascender:
Any part of a lower case character which extends above the X-height.

Alpha channel:
Gray scale channel of 8 bits, used for saving selections.

Animation:
Movement created by combining images.

Animated GIF:
Animation saved as a graphic interchange format file. It is graphic image that moves.

ASP:
Active Server Pages (ASP). Tool or computer application that is used to create dynamic and interactive web pages.