National Pro Fastpitch is a professional softball league where really good softball players play against each other to win games and compete for a championship. Think of it like a big game of dodgeball, but with special rules and really skilled players. These players train really hard and have to be really good at catching and throwing the ball, hitting it with a bat, and running really fast. The league has teams from different cities that compete against each other and they play in big stadiums with lots of people watching. It's kind of like watching a superhero movie, but instead of superheroes, you're watching amazing softball players!