The relationship between ancient poems and couplets?

Couplets belong to a kind of concentrated literature and art. In many literary categories, couplets and metrical poems have very similar characteristics, that is, they both reflect people's lives and express their emotions with the most exquisite language and the most rhythmic rhythm. Compared with metrical poems, couplets have the same essence and different forms. In fact, a good couplet is a poem. It can be said that couplets are a special form of poetry. Poetry appeared earlier, and couplets were born out of the antithesis of regular poetry.