They have started invading our life. They are almost everywhere,
offices, schools, colleges… our homes! They are called computers. Just as
the inventions of the train and the motor car revolutionized the way we travel
from one place to another, computers have revolutionized the way we remember,
write or communicate. Not only do they help us to draft a letter, a report or a
book, but also to send it anywhere even without using any paper! They can like
a radio or television also be used to share our thoughts, our emotions, our
creations with many people, all at once.
A computer is a general purpose device that can be programmed to carry out a set
of arithmetic or logical operations automatically. Since a sequence of
operations can be readily changed, the computer can solve more than one kind of
problem.
A
computer is an information-processing machine, an electronic device,
manufactured in a factory, that can perform many functions-till now done by humans
only. It can see, listen, read, write, speak, show, learn, remember, think,
analyze and decide. In short, it can communicate intelligently. It can do so
not only with humans but also with other computers. It needs electricity from
the main power line to be alive. Without electricity, a computer is a dead
body. If a computer is connected to a UPS (Uninterrupted Power Supply) or a
battery, it can work for a short duration even when there is no electricity.
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Just
as our body has many organs, each of which has a particular function, the body
of a computer is also made up of several parts. Like our brain that controls
other parts of our body, in a computer there is a device called microprocessor
that allows it to take decisions and control its various parts. We have memory
to retain information and ways to do various tasks, so has a computer. We have
a face, a mouth and limbs to express ourselves, a computer has a screen (just
like that of TV) that acts like its face, a device called mouse is like its
limb which can also write,draw and paint, and a small or sing. We have
eyes,ears,nose and skin to help us to know our environment . Similarly, a
computer has a operating system through which you can instruct it to perform
various tasks. Some computers can also hear voices, see objects and sense touch
through a microphone, a camera and a touch screen.
