Docker - A 5 year old's version

How would you explain Docker to a 5 year old?

Docker is like a toy box for computer programs. Just like how you have a toy box to keep all your toys in, Docker keeps all the computer programs in one place. This way, you can easily find the toy or program you want to play with, and not have to search for it all over the house or your computer.

When you want to play with a toy from the toy box, you take it out and play with it. Similarly, when you want to use a program from Docker, you "run" it, and it works just like it would if it were on your computer.

And just like how you can put different types of toys in the same toy box, Docker can hold many different types of computer programs, and they can all work together.

It's like a special container that helps programs run smoothly and easily, without any mess.