An auto is a track which requires no action by the user at all. It works very much like the inspiration for Free Rider, Line Rider.
Usually the author of an auto intends that you don't use any controls. There are also "Press Up" autos or "Press Right" auto and the like, but these are fairly rare.
Autos are sometimes broken when you save and reload because of issues with the way the track is saved.
Autos are very easy to make if one implements the pause button.
If you need inspiration, there are some very good autos on the Database, which can be easily found by searching.

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