Meaning of “yeah” - Learner’s Dictionary

yeah

exclamation us uk /jeə/ informal spoken
Extra Examples
Yeah, I know what you mean."Can you give me a hand?" "Yeah, I suppose so.""You're John's brother?" "Yeah, that's right.""Would you like a lift home?" "Oh yeah.""Is her new car faster than her old one?" "Oh yeah, much."

A2 yes:

Yeah, I agree.

(Definition of “yeah” from the Cambridge Learner’s Dictionary © Cambridge University Press)