Professional sports are games that people play for money. It's like playing with your friends in the park, but instead of just having fun, the players are getting paid for it.
The players who are really good at the game can join teams made up of other really good players, and these teams compete against each other. Some popular professional sports are football, basketball, baseball, soccer, hockey, and golf.
People who really love watching these games can go to the stadium or arena where the games are played, or they can watch on TV. When people watch the games, they can cheer for their favorite team or player.
There are also coaches and trainers who help the players get better at the game. And there are people who work behind the scenes, like managers and agents, who help set up the games and make sure everything runs smoothly.
When a team wins a game, they get points. The team with the most points at the end of the season is called the champion. They get a trophy and a big celebration!