A server computer is a special computer that does a very important job just like a teacher in a school. You know how a teacher helps you learn and manage your homework, a server computer helps lots of other computers talk to each other and share information.
So let's imagine you have a big family and everyone has their own computer to watch videos or play games. You might also have a printer that anyone can use at any time. To make sure everyone in your family can use these things without any problems, you need a server computer coordinating all these devices. This server computer sits in the middle and makes sure that all the devices talk to each other and share their resources like the printer.
The server computer is very powerful, kind of like a superhero that can handle many tasks at once. It can store important files and make sure that they're kept safe. It also controls who can access the files and who can't. So just like how your teacher sets the rules in the classroom, the server computer sets the rules for who can use the resources like the printer.
Another important job of the server computer is to keep everyone connected. It's like the messenger of the family which tells everyone what the others are doing. This makes it possible for everyone in your family to talk to each other and stay up to date with the latest news.
So in a nutshell, a server computer is a really important member of a family of devices. It makes sure that everyone can work and play together nicely without any problems.