Couplet refers to two lines of poetry that follow each other and rhyme.
Couplets also sometimes have the same meter, meaning the same number of beats or the same rhythm.
When spring comes round with her magical wand,
And waves it over every field and pond,
I saw a little blue bird
I didn't even say a word
Little Boy Blue, come blow your horn
The sheep's in the meadow, the cow in the corn.
Humpty Dumpty sat on a wall,
Humpty Dumpty had a great fall.
Examples of Couplets in Literature
Tyger, Tyger burning bright.
In the forest of the night. William Blake
Saints do not move, though grant for prayer's sake,
Then do not move, while my prayer's effect I take. Romeo and Juliet
I love thee to the depth and breadth and height
My soul can reach, when feeling out of sight. Elizabeth Barrett Browning
If this be error and upon me proved,
I never writ, nor no man ever loved. Shakespeare