Okay kiddo, you know how when you play games on your tablet or computer, you can sometimes play with other people from all around the world? Well, those games need something called a game server to make that happen.
Think of a game server like a big playground for all the players. It's a place where all the players can go to play together and have fun. Just like how your playground has a teacher or a grown-up to keep everyone safe, a game server has a computer program that makes sure the game runs smoothly and that all the players can connect to each other.
When you start playing a game on your tablet or computer, your device sends a request to the game server to join the playground. The game server checks to see if there's enough space for you to join and if there are other players who want to play with you. If there's room and other players are ready, the game server lets you in and you can start playing with your new friends!
But the game server doesn't stop there. It also keeps track of your progress in the game, your score, and any special items or powers you might have. That way, when you come back to play the game later, you can pick up right where you left off.
So, that's basically what a game server is. It's a computer program that manages a virtual playground for players to have fun and play games together. Pretty cool, huh?