system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What does auto-tune actually do?

What is it physically doing to someones voice? How much power does it take? Is T-Paine's app an accurate representation of auto-tune?
gpt
Auto-tune uses digital processing to shift the pitch of a voice to the closest note.  That way even if someone sings a bit off-key the audience won't notice[1].  It's something that runs in a digital signal processor, so it doesn't really use any more power than a tiny computer does.

I have no idea what T-Paine's app is.

[1] Well, they might notice the exact characteristics of an auto-tuner, but they won't notice someone being off-key.