The 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. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files.With the K-Lite Codec Pack you should be able to play all the popular movie formats and even some rare formats. K-Lite Mega Codec Pack combines the contents of two packs: K-Lite Codec Pack Full and Real Alternative.