Method overriding is like playing with blocks. You have a big block and a small block that are both shaped the same way. Your mom tells you that you have to put the small block on top of the big block. But then your dad comes and says you can take the small block and put it on top of the big block as well, but in a different way.
In programming, this means you have two methods that have the same name, but they do different things. One method is the big block and another is the small block. You use the same name for both methods because they do similar things. But when you run the program and use the method, you get the result of the small block because it's the one you put on top of the big block.
So overriding a method means you change the way the method works or what it returns. It's like playing with blocks, you can create something new by using what you have in different ways.