Jack is a boy who has a piece of land that he owns. This land is like a big playground that he can play in whenever he wants. Just like how you have your own toys that only you can play with, Jack has his own land that only he can use.
On Jack's land, he can do different things like play games, plant flowers, or even build a treehouse. This land belongs to Jack, so he gets to decide what he wants to do with it. He can use it all by himself or he can invite his friends over to play on his land with him.
Imagine your room. You have your bed, toys, clothes, and everything else that belongs only to you. Just like how you are allowed to choose what you do with your own things, Jack gets to choose what he does with his own land. His land is just a bigger version of your room. Cool, huh?