A computer is an electronic device that accepts data as input, processes that data, and provides results as output. Originally, the term "computer" referred to humans who performed calculations, but it now refers to machines. A typical computer consists of a central processing unit, memory, storage devices, input devices like a keyboard and mouse, and output devices like a display and speakers. Computers are now used for a wide variety of tasks like writing documents, sending emails, accessing the internet, and more.

1. ABOUT COMPUTER
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PRABANJAN
BATCH : BCA 1ST YEAR

2. A computer is a programmable device
that stores, retrieves, and
processes data. The term "computer"
was originally given to humans (human
computers) who performed numerical
calculations using mechanical
calculators, such as
the abacus and slide rule. The term was
later given to mechanical devices as
they began replacing human computers.
Today's computers are electronic
devices that accept data
(input), process that data,

3. Computer overview. Computer connections
Types of computers.
Who makes computers?
Related information.
All computer questions and answers.
History of the computer.
How are computers used today?
What components make up a desktop
computer?
What parts are needed for a computer to work?

4. Below is a picture of a computer with each of the
main components. You can see the desktop
computer, flat-panel display, speakers, keyboard,
and mouse in the picture below. We've also
labeled each of the input devices and output
devices.

5. The first digital computer and what most people think of
as a computer was called the ENIAC. It was built during
World War II (1943-1946) and was designed to help
automate the calculations being done by human
computers. By doing these calculations on a computer,
they could achieve results much faster and with fewer
errors.
Early computers like the ENIAC used vacuum tubes and
were large (sometimes room size) and only found in
businesses, universities, or governments. Later,
computers began utilizing transistors and smaller and
cheaper parts that allowed the ordinary person to own a
computer.

6. HOW ARE COMPUTERS
USED TODAY?
Today, computers do jobs that used to
be complicated much simpler. For
example, you can write a letter in a word
processor, edit it anytime, spell check,
print copies, and send it to someone
across the world in seconds. All these
activities would have taken someone
days, if not months, to do before. Also,
these examples are a small fraction of
what computers can do.

7. Today's desktop computers have
some or all the components
(hardware) and peripherals below.
As technology advances, older
technologies, such as a floppy disk
drive and Zip drive (shown below),
are no longer required or included.

8. All computers have different types of
connections. An example of the back of
a personal computer and brief
descriptions of each connection is found
on our computer connections page.

9. A computer does not require all the
components mentioned above.
However, a computer cannot function
without having at the very minimum the
parts listed below.

10. Computers can be classified as one of three types of computers: a general-purpose
computer, special-purpose computer, or specialized computer.
A general-purpose computer is what most people think of when thinking about a
computer and is what this page covers.
A special-purpose computer is embedded in almost all electronic devices and is
the most widely-used computer. This computer is designed for a specific task and
is found in ATMs, cars, microwaves, TVs, the VCR, and other home electronics. See
our special-purpose computer page for further information and examples.
A specialized computer is like a general-purpose computer but is designed only to
perform one or a few different tasks. See our specialized computer for further
information and examples of these computers.
When talking about a computer or a "PC," you're usually referring to a desktop
computer found in a home or office. However, the lines of what makes these
computers are blurring. Below are different examples of what's considered a
computer today.

11. Today, there are two types of
computers: the PC (IBM compatible)
and Apple Mac. Many companies make
and build PCs, and if you get all the
necessary parts for a computer, you can
even build a custom PC. However, with
Apple computers, only Apple designs
and makes these computers. See
our computer companies page for a
listing of companies (OEMs) that make
and build computers.

12. How to use a computer.
Basic computer troubleshooting.
How to install computer hardware.
What makes a computer fast and
powerful?
How to learn more about computers.
Why should I learn about computers?
Now that I've got a computer, what can I
do?
What came before computers and mobile
devices?