The K-Lite Codec Pack is a collection of DirectShow filters, VFW/ACM codecs, and tools. Codecs and DirectShow filters are needed for encoding and decoding 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.
The standard variant contains some additional features compared to the basic variant. It contains Media Player Classic, which is an excellent player for video files. It also has (better) support for playback of DVDs. This pack is recommended for the average user.