throw:
Imagine you're in charge of a game, and one of the rules is that players can't have negative scores. If someone tries to enter a negative score, you'd say, "Hey, that's against the rules! You can't have a negative score in this game." In Java, throw works similarly. It's like shouting, "This is wrong!" when something unexpected or against the rules happens in your code. It stops the program and says, "Hey, something's not right here, and I'm going to let you know about it by creating a special message (an exception) that explains the problem."

throws:
Now, let's say you're playing a game with your friend, and you've set some tricky rules. If your friend breaks one of these rules, instead of stopping the game entirely, you might just give them a heads-up, like, "If you do this, something unexpected might happen." In Java, throws is a way of saying, "Hey, there's something that might go wrong here, and I'm warning you in advance that it might cause a problem." It's like a caution sign, letting others know, "Be careful, I might have issues that need to be handled properly."

So, throw is like forcefully saying, "This is wrong, stop here!" while throws is more like a warning sign saying, "Hey, heads up, something might go wrong here, handle it carefully!"