Autodances are short clips of players dancing to a specific song. It features sped up remixes of the recordings. Autodances were an Xbox 360 exclusive on Just Dance 4. They became available for every console (except for Wii) starting with Just Dance 2014.
Kinect and PS Eye/Camera equipped consoles automatically record Autodances after a song is started.
On the Wii U, Autodances are recorded via the gamepad camera, and the recording has to be started manually. Since Just Dance 2016, due the lack of karaoke mode, the Wii U gamepad will automatically record Autodances. This feature can be turned off in the extras menu.