XVID // DIVX
Xvid is a primary competitor of the DivX Pro Codec (Xvid being DivX spelled backwards). In contrast with the DivX codec, which is proprietary software developed by DivX, Inc., Xvid is free software distributed under the terms of the GNU General Public License.[1] This also means that unlike the DivX codec, which is only available for a limited number of platforms[2], Xvid can be used on all platforms and operating systems for which the source code can be compiled.
Wiki rip but common knowledge among nerds like me lol
Also Xvid encoded files can be written to a CD or DVD and played in a DivX compatible DVD player. However, Xvid can optionally encode video with advanced features that most DivX Certified set-top players do not support.