What is a couplet?

A couplet is a pair of lines in a poem that usually rhyme and have the same meter. They are often used to convey a complete thought or idea within the poem. Couplets can vary in length and rhythm, but typically consist of two lines of the same length that rhyme with each other. They are commonly found in many forms of poetry, including sonnets, ballads, and nursery rhymes. Couplet is a common form used in English poetry, and it can also be found in other languages such as French and Italian.