Rhyme

Definition: A repeating of similar sounds at the end of each line.
Example:

I say yes and you say no
I say bye and you say hello
Butterfly's fly and penguins swim
Professionals lie and adventures go on whim
If you go up I go down
An emo to a happy clown
Girlie girls pink and fat ones brown
Smiles right side up and frowns up side down
A rainbow to a black plain thing
A monotone to an opera sing
A rainy cloud to a sunny day
Bright colors and something gray
A beginning to an ending
A broken heart and then something mending
Significance: It sounds funnier and captures the reader's attention. Also, it helps the readers to memorize the poem better with all the similar vowels.