Why is an example of onomatopoeia?

You're asking for an example of onomatopoeia, not an explanation of what it is. Here are some examples:

* Animal sounds: Woof, meow, moo, oink, tweet, chirp

* Actions: Bang, boom, crash, pop, sizzle, hiss

* Nature: Rustle, whoosh, drip, splash, gurgle

* Objects: Tick-tock, clink, clang, thud, screech

Let me know if you want to know more about the concept of onomatopoeia! 😊