The .ogg file extension is most commonly associated with the Ogg Vorbis file format. "Ogg" referrs to the container format of these files and "Vorbis" refers to the compression technology designed for the OGG file format.
Ogg is an open container format that is used for the streaming and manipulation of audio and video files over the Internet. The OGG file format is frequently used to create and distribute music and movie files. While the OGG file format is somewhat similar in nature to the MP3, VQF and AAC formats, unlike these formats the OGG file format is free and unpatented.
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