A "refrain" is a repeated line or group of lines in a poem or song, often found at the end of a stanza. It serves to emphasize a particular theme or emotion, making the piece more memorable. Refrains can create a sense of rhythm and unity, helping to reinforce the overall message of the work. In music, refrains are commonly known as choruses, where the same melody and lyrics are repeated throughout the song. This repetition allows listeners to engage more deeply with the song, as they can anticipate and sing along with the familiar lines. Refrains are a key element in many genres, including folk music, pop, and rock.