An interactive experience, where the interaction has been play-balanced to achieve optimal playability.

Acronym: Graphic Interchange Format. A file format for graphic files to display on Web pages, and the filename extension for such a file. Pronounced "Jiff" or "Giff" (hard "G").

Acronym: Graphical User Interface. Pronounced "Gooey". A way of presenting the functions, features and contents of a program by using visual elements, such as icons, as opposed to text.