What the heck is Ogg?

Ogg is short for Ogg Vorbis and it's a codec for audio files.  What is special about Ogg vorbis is that it's an open source codec, meaning that everyone can use it to decode/encode audio files without any restrictions on use.  Ogg Vorbis is a contribution by xiph.org, an organization dedicated to open media formats.  Visit vorbis.com for more information and to download setup files for your computer.