Is takeback allowed in real chess? Is takeback allowed in real chess?

All chess engines allow take backs, but that's not important, it's just a computer, we make mistakes and correct them.

My question is about real chess, is it allowed? both online and in real tournaments? What about the one touch rule?
The answer for tournament chess is clear - one cannot request or approve a takeback. On certain chess servers, takebacks are allowed if agreed to by both players. The Internet Chess Club supports this feature, but others like Chess.com do not.