K-Lite Codec Pack Update is a free cumulative update for the latest version of the popular K-Lite Codec Packs.
The K-lite series of packages are a collection of audio and video playback components in DirectShow players such as Windows Media Player, Media Center, and Media Player Classic. They also provide additional functionality such a thumbnail generation in Explorer.
There are four variants of the K-Lite Codec Pack:
K-Lite Codec Pack Basic contains everything you need to play all the common video file formats. Such as AVI, MKV, MP4, OGM, and FLV. This pack is for those who like a small, no-nonsense pack. It is small but powerful. K-Lite Codec Pack Standard contains a few additional features compared to the basic variant. It includes Media Player Classic, which is an excellent player for video files. This pack is recommended for the average user. K-Lite Codec Pack Full has some extras compared to the standard variant. It additionally GraphStudioNext, and a few extra DirectShow filters. K-Lite Codec Pack Mega is the complete pack. It additionally contains VFW/ACM codecs for video encoding/editing.