A CPU is like the brian of the whol works it stores all of them memory holds application and many other things.
You use your mouse to move thing around or click on them it would be difficult to use a computer without a mouse.
A monitor is a part on the computer also known as the screen. This part of a computer is where you can see everything
The keypad is what a person would use to type up everything they needed to.
Tis object is used to scan stuff so you can see or edit it on a computer if you need to.
The printer is for printing out things that need to be printed so you can present them on a peice of paper.