Blank displays an inspirational quote, then makes your TV screen black. You can tap the MENU button at any time to return to the Home screen.
Very simple, but why?
With an Apple TV connected by HDMI-CEC to your TV, theres no way to turn off the screen while you listen to music or a podcast. If its late in the evening and youre trying to wind down, a dark room helps you sleep better.
Blank keeps your room dark while you relax.
There is none more black.