Okay kiddo, the PSA World Tour is like a big game or a competition for really good players in the sport of squash. You know how you like to play tennis with your friends sometimes? Well, squash is kind of like tennis, but you play in a small room with four walls and a ceiling, and you hit a small rubber ball that bounces really fast off the walls.
The PSA World Tour is where the best squash players from all over the world come together and play against each other to see who is the best. It's kind of like a giant tournament, and the players have to win a certain number of games or matches to move on to the next round.
Some players on the PSA World Tour are really famous and have won a lot of games and championships, like Mohamed ElShorbagy and Ali Farag. They train really hard every day to make sure they are the best they can be.
At the end of the season, the player who has won the most games and done the best overall gets a really big trophy and lots of money. It's like the Olympics or the World Cup, but just for squash players.
So that's the PSA World Tour in a nutshell, kiddo. It's a big competition for the best squash players in the world to see who is the champion.