A black hole is like a super strong vacuum cleaner in space. It has a powerful force called gravity that can pull in anything that gets too close, even light! That's why it's black and very hard to see. Once something gets pulled in, it can't come out, so it's important for us to study these black holes from a safe distance.
Imagine you are a famous astronomer. Explain the concept of a black hole as if you were explaining it to a curious child.