In the demo scene, intro is the same "demo" (a program that creates an audio—visual show in real time), but with one strict condition: a strict limit on the size of the executable file.While a regular demo can be the size of a disk or more, an intro is the art of packing maximum content into a tiny amount of data.

Popular categories (nominations): 64k Intro, 4k Intro, 64 byte/256 byte/1k.