Imagine you have a box full of toys and you want to make sure none of them go missing. That's where a keep comes in! A keep is like a special place where you put your toys (or other things) to keep them safe and make sure nothing happens to them. It's like a guard or protector for your important items.
For example, in a castle, there is the "keep" which is a tall tower that was used to protect people and treasure from enemies. In computer programming, a "keep" is a way to store data or information so that it doesn't get lost or damaged.
In short, a keep is a safe and secure space for important things that you want to make sure are always there when you need them.