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Computer is no longer something new and magical to many people nowadays, because many families now have at least
one computer in their homes. It is without doubt that there
are thousands and millions of computer users in the
country, but is it ever possible for all of them to explain
how a computer works? No. Alright, can they even classify
the components of a computer appropriately? Not quite. They
may know how to describe the physical appearance of a
computer and they will probably include two or three other
terms as well, such as monitor, keyboard or a mouse.
Nonetheless, classification of a computer should not be
done this way. In fact, a computer can be broken down into
three distinct categories, namely output, input and CPU.

The term 'output' consists of all components that display
words and graphics so that a person can see them. Many
people can easily understand why the monitor is a form of
output device since it is the screen that tells them what
the computer is actually doing. Simply put, without a
monitor, the computer itself is basically useless. Another
form of output, which is rarely noticed by many computer
users however, is the printer. Many people have probably
used a printer before, but it is just that they never
realize it is also a form of output.

As opposed to 'output', 'input' consists of components that
take in information from the users themselves so that the
computer will know the tasks it is supposed to perform and
accomplish. The keyboard is classified as a form of input
because this is where the users enter commands and text.
There are many other forms of input as well. Nonetheless,
many people just don't realize them, or are too lazy to
classify them. For instance, the mouse belongs to input,
since it provides a floating pointer on the screen so that
the users can access commands faster and easier. The
scanner is another form of input, because it acts like a
photocopier, except it scans the image and makes it onto
the computer screen instead of onto a piece of paper.

The CPU, Central Processing Unit is probably the most
important category of the three. As the name implies, it is
the soul of a computer, very much alike the human brain.

For unknown reasons though, people often call the CPU a
computer. This is absolutely incorrect. The word computer
is merely a general term which must always include all the
three categories in order to operate. Perhaps the
constituents of a CPU itself should be mentioned. Simply
stated, this central unit must have memory blocks to store
data temporarily; disk drives to store data permanently;
and last but not least, the main processor chip which
performs all the jobs and mathematical calculations, as
well as determines the speed of a CPU.

These are the three categories that the readers must know
should they need to classify a computer again in the
future. Also, it can be seen that a computer is not as
simple as many people think it is, for it consists of many
internal components which are often neglected and ignored.
It should also be emphasized that the components listed in
this essay are not the only ones available, since
developers and manufacturers will continue to bombard the
market with newer and more sophisticated gadgets everyday.

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