DivX

See also: Xvid

DivX stands for Digital Video Xtreme. It is known as a video codec which has good compression ratios while preserving a good quality based on the H.263 codec. It is closed source.
When DivX Inc. introduced the DivX6 format DivX became a container, too. The file extension for the DivX container is .divx (Still under development) but normally the DivX encoded video will reside inside an AVI container.

XSUB is the subtitle format for DivX 6.