Feedback to a message can be given by paraphrasing,questioning,nodding,gesturing,or even eye movement.So the feedback can be both verbal and nonverbal.

Verbal Feedback

Oral responses and comments given to convey opinions or provide constructive criticism about someone's action or performance.

Paraphrasing

The act of rewording or rephrasing text or speech to achieve clearer understanding or alternative expression without changing the original meaning.