intro

cousins of demos, intros are small (in size) demos ranging usually from 4kb up to 64kb. Being small, they often have experimental soundtracks with very lofi samples. The effects are usually more innovative than those featured in a demo. The challenge is higher too!

intro n.

[demoscene] Introductory screen of some production. 2. A short demo, usually showing just one or two screens. 3. Small, usually 64k, 40k or 4k demo. Sizes are generally dictated by compo rules. See also dentro, demo.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.