Imagine you are playing a game with your friends called baseball. When someone throws a ball to you, you have to hit it with a stick and try to run to a base before someone catches the ball and tags you.
In baseball, the pitcher is the person who throws the ball to the person who is trying to hit it. The distance between the pitcher and the person trying to hit the ball is called the pitch.
An eight foot pitch means that the distance from the pitcher to the person trying to hit the ball is 8 feet. That's about as long as a standard bed, or maybe 2 of your little brothers lined up side by side.
This distance is important because it affects how hard it is to hit the ball. The closer the pitcher is to the person trying to hit the ball, the harder it is to hit the ball because they have less time to react.
So, in summary, an eight foot pitch is the distance between the pitcher and the person trying to hit the ball in the game of baseball. It's the space where the game happens and affects how hard it is to hit the ball.