The National Football League (NFL) is a big group of organized sports teams that compete against each other in a game called football. Just like how you have your own gym class at school where you play games and sports with your friends, the NFL is a very big version of that.
There are 32 teams in the NFL and they belong to two different groups or "conferences", which are the American Football Conference (AFC) and the National Football Conference (NFC). These teams compete against each other during the regular season (which is like their school year), and the best ones get to play in the playoffs (like the championship games at the end of the year).
Each team has a bunch of players on its roster that work together to try and score points by moving the football from one end of the field to the other end (like a really big game of tag). The team with the most points at the end of the game wins.
There are a bunch of different positions on a football team, like the quarterback, wide receiver, running back, and defensive lineman, and each player has a specific role to play in the game. The quarterback is like the leader of the team and throws the football to his teammates. The wide receiver catches passes from the quarterback and runs with the ball. The running back carries the ball to gain yards and the defensive lineman tries to stop the other team from moving the ball.
The NFL is a really big business and millions of people watch it every year, either in person at the games or on TV. People have their favorite teams and players, and they get really excited when they win games or the championship. It's a lot of fun to watch and play, and it can teach you how to work together as a team and be a good sport.