K-Lite Codec Pack is a collection of VFW/ACM codecs, DirectShow filters and tools. Codecs and DirectShow filters are needed for encoding and decoding (playing) audio and video formats. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your audio and movie files. With the K-Lite Codec Pack you should be able to play all the popular audio and video formats and even several less common formats.
There are four versions of the K-Lite Codec Pack: Basic, Standard, Full and Corporate.
Basic contains only the most essential things. It contains everything you need to be able to play the two most popular and widespread formats: DivX and XviD. With this you should be able to play DVDrips and TVrips.
Standard contains everything you need to play all the commonly used formats. This package should be enough for the average user.
Full supports even more audio and video formats. It also has encoding support for various formats. This package is for power users and people who do video editing/encoding.
Corporate Edition is a special version for use in a corporate environment. It is similar to the Full version, minus a few items, but almost just as powerful. It has a strong focus on open-source software.
The K-Lite Codec Pack is compatible with Windows 2000, XP, 2003, Vista, and Seven.