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, sympathy, or agreement, rather than conveying significant information. Examples of backchanneling in English include such expressions as "yeah", "OK", "uh-huh", "hmm", "right", and "I see".