Alright kiddo, do you know what a missile is? It's like a very fast plane that can carry things like explosives.
Now, an anti-ship ballistic missile is a special kind of missile that is designed to destroy boats, ships and anything that floats on the water. It's called "ballistic" because it flies high up into the sky like a ball, and then comes down really fast like a dart.
These missiles are very powerful and can cause a lot of damage. They are used by countries that have enemies who have ships, and want to destroy them.
Imagine you are playing with your toy boats in a pool and you throw a big ball at them really fast. That's what an anti-ship ballistic missile does but on a much bigger scale.
Because these missiles are so powerful, many countries work very hard to protect their ships from getting hit by them. They use special shields and other tricks to try and stay safe.
So, in short, an anti-ship ballistic missile is a special kind of missile that is made to destroy ships, and it's very powerful and dangerous.