XviD is a video codec for PC, whereas codec is an abbreviation for [co]der/[dec]oder, hence describes a program to encode and decode digital video. The purpose of encoding video data is to reduce redundancies – that means to make it smaller for faster transmission over computer networks or for more efficient storage on computer disks.

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. This also means that unlike the DivX codec, which is only available for a limited number of platforms, XviD can be used on all platforms and operating systems for which the source code can be compiled.

Xilisoft Video Converter is multifunctional and easy-to-use software which can not only help you convert among popular videos, especially for converting XviD to AVI, but also can edit video effects and so on.