Couplet

Definition: they are poems comprised of two rhyming lines of verse, they can be as short as one couplet, two lines, or as long as it takes to tell the poem.

Example:

   A couplet is a very little thing,
Yet give it the right words and it takes wing. 

Significant: we use couplet in poems to make it sounds more interesting, more fun to read aloud, because sometimes they rhyme, that make the poem better.