Computer
is an electronic device that is designed to work with Information.The term Computer is derived from the Latin
term ‘computare’, this means to calculate.Computer can not do anything
without a Program.it represents the decimal numbers through a string of binary
digits. Computer is an advanced electronic device that takes raw data as input
from the user and processes these data under the control of set of instructions
(called program) and gives the result (output) and saves output for the future
use.The Word 'Computer'usually refers to the Center Processor Unit plus Internal memory.Computers are machines that perform tasks or calculations according to a
set of instructions, or programs. The first fully electronic computers,
introduced in the 1940s, were huge machines that required teams of people to
operate. Compared to those early machines, today's computers are amazing. Not
only are they thousands of times faster, they can fit on your desk, on your
lap, or even in your pocket.
Computer is an electronic device that is designed to work with Information.The term Computer is derived from the Latin
term ‘computare’, this means to calculate.Computer can not do
anything without a Program.it represents the decimal numbers through a
string of binary digits. Computer is an advanced electronic device that takes
raw data as input from the user and processes these data under the control of
set of instructions (called program) and gives the result (output) and saves
output for the future use.The Word 'Computer'usually refers to the Center Processor Unit plus Internal memory.Computers are machines
that perform tasks or calculations according to a set of instructions, or
programs. The first fully electronic computers, introduced in the 1940s, were
huge machines that required teams of people to operate. Compared to those early
machines, today's computers are amazing. Not only are they thousands of times
faster, they can fit on your desk, on your lap, or even in your pocket.
Computers work through an interaction of hardware and software.
Hardware refers to the parts of a computer that you
can see and touch, including the case and everything inside it. The most
important piece of hardware is a tiny rectangular chip inside your computer
called the central processing unit (CPU), or microprocessor. It's the "brain" of your computer—the part
that translates instructions and performs calculations. Hardware items such as
your monitor, keyboard, mouse, printer, and other components are often called
hardware devices, or devices.
Software refers to the instructions, or
programs, that tell the hardware what to do. A word-processing program that you
can use to write letters on your computer is a type of software. The operating
system (OS) is software that manages your computer and the devices connected
to it. Windows is a well-known operating
system.
Types of computers
Computers range in size and capability. At one end of the scale
are supercomputers, very large computers with
thousands of linked microprocessors that perform extremely complex calculations.
At the other end are tiny computers embedded in cars, TVs, stereo systems,
calculators, and appliances. These computers are built to perform a limited
number of tasks.
The personal computer, or PC, is designed to be used by one person at a time. This
section describes the various kinds of personal computers: desktops, laptops,
handheld computers, and Tablet PCs.
Desktop computers
Desktop computers are designed for use
at a desk or table. They are typically larger and more powerful than other types
of personal computers. Desktop computers are made up of separate components. The
main component, called the system unit, is usually a
rectangular case that sits on or underneath a desk. Other components, such as
the monitor, mouse, and keyboard, connect to the system unit.
Desktop computer
Laptop computers and small notebook PCs
Laptops are an expensive investment, and as they become more and more
vital to everyday life, people need to carry them everywhere. Laptop
sleeves are slim, form-fitting, protective cases that offer some
protection to computers while minimizing extra bulk.Laptop computers are lightweight mobile
PCs with a thin screen. Laptops can operate on batteries, so you can take them
anywhere. Unlike desktops, laptops combine the CPU, screen, and keyboard in a
single case. The screen folds down onto the keyboard when not in use.
Small notebook PCs (often referred to
asmini-notebooks), are small, affordable laptops that
are designed to perform a limited number of tasks. They're usually less powerful
than a laptop, so they're used mainly to browse the web and check e‑mail.
A laptop computer and a small notebook PC
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