Four Functions of a Computer:
INPUT – computer accepts data from the user. You can provide
the computer with input by keying using a keyboard, pointing and
clicking a mouse, pointing a stylus, or speaking into a microphone.
STORAGE: The computer saves (stores) information or
instructions using:
o Floppy disk, hard disk, CD/DVD-ROM, USB
devices
o Size of a storage device is measured in megabytes or
gigabytes
 Bit
1 or 0
 Byte
Equal to one character (8 bits)
 Kilobyte
1000 bytes
 Megabyte
One million bytes
 Gigabyte
One billion bytes
 Terabyte
One trillion bytes
PROCESSING – The computer interprets and processes the data
that you input. It adds, multiplies, divides, finds or manipulates
data or text to complete a task you have given it.
 Uses CPU and RAM (holds information temporarily)
OUTPUT: The computer displays or produces information that has
been processed. The output might be something you see on the
screen (monitor), something you hear (audio), or something you
ask the computer to print (printer).