a prelude or introduction of any sort

A demo of limitted size, usually 4 of 64k.

An intro is a short video sequence (mostly used in a youtube video) that is supposed to make a channel look professional. A 3D or 2D intro is usually around 10 seconds long while a gameplay intro can be as long as a minute, which can harm a subsriber's interest in a video.

Short for introduction. See outro.

A sampling of a product being offered.

Something u say to let people know who featured or who the song is by

Intro = their artist/producer name