Ogg Vorbis is an audio compression format roughly comparable to other digital audio formats such as MP3, VQF, AAC. Since it is completely free, open, and unpatented, Ogg Vorbis has been designed to completely replace all proprietary, patented audio formats. Ogg Vorbis format was first widely used by game developers for compressing game music, to avoid patent-license fees. It now has been widely adopted by music artists, fans and developers.