Okay kiddo, you know how you sometimes use a computer at home to play games or do homework, right? Well, a portable computer is like a computer that you can take with you wherever you go, like to your friend's house or on a trip.
It's kind of like a backpack that you wear on your back, but instead of pencils and paper, it has a screen, keyboard, and lots of wires and buttons inside. These wires and buttons are called the "hardware" and they help the computer work.
When you turn on the portable computer, the screen lights up and you can start using it just like you would a regular computer. You can keep it on your lap or on a table, and it's easy to move around because it's not too heavy.
And because it's portable, you don't need to be in one place to use it. You can use it in the car, on a plane, or even outside in the park if you want to! It's a really cool invention that lets you take your computer with you wherever you go.