It's the use of words that imitate the sounds they represent. Some examples include:
* Sizzle: The sound of something cooking in a pan.
* Buzz: The sound of a bee or a fly.
* Meow: The sound a cat makes.
* Bang: The sound of a door slamming shut.
* Clang: The sound of metal hitting metal.
Onomatopoeia is a fun and engaging way to bring language to life!