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In linguistics, a backchanneling during a conversation occurs when one participant is speaking and another participant interjects responses to the speaker. A backchannel response can be verbal, non-verbal, or both. Backchannel responses are often phatic expressions, primarily serving a social or meta-conversational purpose, such as signifying the listener's attention, understanding, or agreement, rather than conveying significant information. Examples of backchanneling in English include such expressions as "yeah", "OK", "uh-huh", "hmm", and "right".

I notice that many people hate listening to podcasts where people linguistically backchannel extremely often. And I can even annoy myself if I do it a lot during conversation. Only because for me, its an old habit from my hyper-agreeable days. When I was a pushover. (Not that someone has to be a pushover to use them. I still use them. Just not as much so they're more meaningful.)