Wikipedia: Ogg

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The Ogg file format has been designed by Xiphophorous? as a free and open alternative to multimedia formats such as Quicktime?. The main user of the system at the time of writing is the Vorbis lossy audio compression format.

The Ogg file format has been designed by Xiphophorous? as a free and open alternative to multimedia formats such as QuickTime and [Windows Media]?.
As of November 2001, implementations support only the Vorbis lossy audio codec, but developers continue to work on other codecs.

*Vorbis: perceptual lossy audio compression that has already surpassed MP3 in quality bit-for-bit
*Tarkin?: lossy video compression
*MNG: animation based on PNG and JPEG. Ogg MNG can potentially replace the various incompatible [motion JPEG]? systems in existence.
*XML: text, good for subtitles and captions

References

*Xiphophorus's Ogg page (http://www.xiph.org/ogg/)

Vorbis: perceptual lossy audio compression that has already surpassed MP3 in quality bit-for-bit
Tarkin?: lossy video compression
MNG: animation based on PNG and JPEG. Ogg MNG can potentially replace the various incompatible [motion JPEG]? systems in existence.
XML: text, good for subtitles and captions

References

Xiphophorus's Ogg page (http://www.xiph.org/ogg/)