This document discusses rhyme scheme in poetry. It defines rhyme scheme as the pattern of rhyming lines at the end of each verse, described using letters. An example of an ABAB rhyme scheme is provided from Shakespeare's "Shall I Compare Thee". Common rhyme schemes are then outlined, including alternate, couplet, enclosed, ballad, terza rima, and limerick. The functions of rhyme scheme are noted as adding beauty, flow, and memorability to poetry. Poets choose schemes for different purposes and levels of complexity.