XviD is the name of a popular new video codec being developed as an open source project by volunteer programmers from all over the world. The format was created to offer a free alternative to other commercial video codecs, and despite being open source its quality and efficiency has made it one of the most popular video codecs online. While XviD still isn't as widely used as DivX, playback of XviD movies is usually supported in new DVD players nowadays.
However, XviD is more popular in the underground movie release community than most commercial codecs such as DivX. So if you have a problem playing a ripped movie, try installing the XviD codec. After installation, you can watch your favorite movies in the media player of your choice.
Get XviD codec: XviD codec v1.1.2 for Windows (Direct Download)