Outer Hardware
 Take a look at the computer in front of you. No, not just the screen. Look at all of the other parts. Do you know what they are? Do you know what they do? If you already know - great! Give yourself a big pat on the back! But if you don't know about all the gadgets surrounding your computer, then read on and find out!

The Basics
Lets start with the center of any computer system. Do you see something shaped like a box nearby? It will have a power switch and a light or two. It should also have a place or places to insert disks. This is the case that houses all of the important computer components. If it stands up tall, it is a tower case. If it sits flat, it is a desktop case. Ask your parents to let you look at the back of the computer (never do this without permission, because there is a lot of dangerous electricity back there!). You will see lots of cords and cables coming out of the back of the case and going to other computer parts like the monitor.

Your computer case probably has a place to insert floppy disks or CDs. These are called the floppy disk drive and the CD-ROM. The floppy disk drive reads information from a very thin disk that is inside a flat, square plastic case. You can also write information to these disks and 'save' it. CD-ROM is short for Compact Disk - Read Only Memory. A compact disk is a shiny, circular disk that stores information. A CD-ROM can only read information from the disk. Many new computers have a CD-RW (RW stands for ReWrite) instead of a CD-ROM. CD-RW allows you to write information to the disk as well as read from it. Also, some new computers have a DVD (Digital Video Disk) drive instead of a CD-ROM or CD-RW. A DVD looks just like a CD, but it holds much more information. You can watch movies, listen to music, or play computer games from DVDs. One important

Input Devices
There are several ways to get new information or input into a computer. The two most common ways are the keyboard and the mouse. The keyboard has keys for characters (letters, numbers and punctuation marks) and special commands. Pressing the keys tells the computer what to do or what to write. The mouse has a special ball that allows you to roll it around on a pad or desk and move the cursor around on screen. By clicking on the buttons on the mouse, you give the computer directions on what to do. There are other devices similar to a mouse that can be used in its place. A trackball has the ball on top and you move it with your finger. A touchpad allows you to move your finger across a pressure sensitive pad and press to click.
 

Other types of input devices allow you to put images into the computer. A scanner copies a picture or document into the computer. There a

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