K-Lite Codec Pack is a collection of codecs and related tools. Codec is short for Compressor-Decompressor. Codecs are needed for encoding and decoding (playing) audio and video. This Codec Pack is designed as a user-friendly solution for playing all your movie files. You should be able to play all the popular movie formats and even some rare formats. Full contains even more codecs. It also has encoding support for various formats. This package is for power users and people who do their own encodings.