A quatrain is a poem in verse composed of four lines. It is the most common metric form of European poetry; the classical rhymes are of the AABB, ABAB, ABBA, ABCB type. In a broader meaning, the term refers to a poem of only four verses or to a single part of a composition composed of several quatrains.
The quatrain already appears in the poems of ancient civilizations, including ancient Greece and ancient Rome.
