// mime type · audio / video type
video/ogg
Ogg video · .ogv
What video/ogg is
video/ogg is Ogg-container video (Theora). It's an older open format, largely replaced by WebM for royalty-free video today.
How it's used
You'll see this as a Content-Type value on requests and responses — for example Content-Type: video/ogg. It's the type associated with the .ogv file extension. Audio and video types identify media formats for playback in the browser or a media player.