The picture above shows an internal view of some of the I/O ports on the right and a covered view on
the left. I/O stands for Input and Output. The most common device for input is the keyboard. When
you type, you are putting information into the computer, which is known as input. The most common
device for output is the monitor. After the information has made its way through the computer, it
is sent out to the monitor for us to see. This is known as output. On the back of computers are several
I/O, (or Input/Output), ports. Above, on the very top are two PS/2 ports, normally used for mouse and
keyboard connections. Below that are the USB, (or Universal Serial Bus), ports. Below those are two
serial ports beside a long parallel port that is often used to connect to a printer. On the bottom right
is a game port for joysticks or other game controllers. On the bottom left is a microphone hook up, a
speaker hook up, and an additional hook up for another sound input device like a musical keyboard.
Below is a picture of the I/O ports on a more recent computer.