Okay, let's imagine we are playing a game, like soccer or basketball, but instead, we are going to talk about a game called League of Legends. In League of Legends, millions of people from all over the world play against each other.
Now, imagine that all these people are split into groups based on how good they are at the game. We can call these groups "leagues." Each league is like a different level. When you start playing the game, you join the lowest league called Iron. As you get better, you can move up to higher leagues like Bronze, Silver, Gold, Platinum, Diamond, Master, Grandmaster, and then finally, Challenger.
To move up to a higher league, you need to win games. Winning games makes you gain points, and when you have enough points, you can promote to the next league. For example, if you are in Silver, and you win enough games, you can go up to Gold.
But here's the catch: if you lose too many games, you can go down to a lower league. Losing games makes you lose points, and when you lose enough points, you can demote or go down to the previous league. This is to make sure that everyone is playing against people of similar skill levels, so the games are fair and fun.
At the end of each season, which is like a big tournament, there are rewards for people who did well in their league. The better you did, the cooler rewards you get. It's like getting a medal or a trophy in real life for being good at sports or a game.
And that's the league system in League of Legends! It's a way to separate players based on their skill levels, give them goals to work towards, and reward them for their achievements.