Bounding point is like playing a game of "hot or cold" with your eyes closed. Imagine you're playing hide and seek and your friend tells you whether you're getting closer or farther from them. You use that information to try to find them.
A bounding point is like this, but for computers. It's a point that helps a computer know whether a certain object is close enough to another object to interact with it. For example, if you're playing a video game and you shoot a gun, the game needs to know if the bullet hit the bad guy or not. The game creates a bounding point around the bad guy, kind of like a bubble. As the bullet moves, the game checks to see if it enters that bubble. If it does, then the game knows that the bullet hit the bad guy and can show an animation of the bad guy getting hurt.
So a bounding point is a way for a computer to know if two things are close enough to each other to interact, without having to check every single possible spot. It's like telling the computer "you're getting hotter" or "you're getting colder" until it finds what it's looking for.