Okay kiddo, have you ever heard of the word "accidental"? It means something that happens by chance or by accident, like dropping your toy by mistake. Well, in philosophy, there is something called "accidentalism" that talks about how things in the world can be accidental.
You see, some philosophers believe that everything in the world has a certain purpose or meaning, like how a hammer is meant for hammering nails. But, accidentalism says that sometimes things just happen by chance and don't have any particular purpose, like a rock falling off a cliff.
Accidentalism also says that sometimes people can do things without meaning to, like accidentally breaking a vase, and that doesn't necessarily mean they had a bad intention. It's just an accident.
So, to put it simply, accidentalism is a philosophy that teaches us that sometimes things can happen by chance and that's okay. We don't always have to have a reason or purpose for everything that happens in the world.