Onomatopoeia

Definition: a word or phrase that, when pronounced, sounds like the actual thing it's describing.

Example:
Slam! Slam!
Go the car doors.
Jangle! Jangle!
Go the house keys.
Jiggle! Jiggle!
Go the keys in the door.
Squeak!
Goes the front door!
Thump! Thump!
That is me running down the stairs.
Guess what?
Mom and Dad are home!!
Significance: Onomatopoeias help the readers to imagine the scene using their auditory senses.