Ogg Vorbis is an audio compression
format, comparable to other formats used to store and play digital
music, but differs in that it is free, open and unpatented. The Ogg Vorbis specification is in the public domain and if freely available for commercial or noncommercial use. In Ogg Vorbis, Ogg
refers to the Ogg Project which is an Open Source
multimedia initiative, while Vorbis
is the actual compression format.