What is a pair of rhyming lines in poetry usually of the same length called?

A pair of rhyming lines in poetry of the same length is called a couplet. This term specifically refers to two consecutive lines that typically rhyme and often have the same meter or rhythm. Couplet forms are commonly used in various poetic structures, including sonnets, where they can serve to emphasize a particular point or conclude a thought in a powerful way. The distinct rhyming pattern helps create a musical quality in poetry and can enhance its overall emotional effect. The other terms, while related to poetry, refer to different concepts: a quatrain consists of four lines, a stanza is a grouped set of lines within a poem, and verse refers to any line or stanza of poetry.