What is a computer?.
Computer is an advanced electronic device that takes raw data as an input from the user and processes it under the control of a set of instructions (called program), produces a result (output), and saves it for future use. This tutorial explains the foundational concepts of computer hardware, software, operating systems, peripherals, etc. along with how to get the most value and impact from computer technology.
Charles Babbage is called the “Grand Father” of the computer. The First mechanical computer designed by Charles Babbage was called Analytical Engine. It uses read-only memory in the form of punch cards.
Functionalities of a
Computer
There
are three basic functionalities of a Computer System and they are
- Input
- Process
- Storage
- Output
But
if we look at it in a very broad sense, any digital computer carries out the
following five functions:
Step
1 - Takes data as input.
Step
2 - Stores the data/instructions in its memory and uses them as required.
Step
3 - Processes the data and converts it into useful information.
Step
4 - Generates the output.
Step
5 - Controls all the above four steps.
CHARACTERISTICS OF
COMPUTER
- Speed The computer can process data very
fast, at the rate of millions of instructions per second. Some calculations
that would have taken hours and days to complete otherwise, can be completed in
a few seconds using the computer. For example, calculation and generation of
salary slips of thousands of employees of an organization, weather forecasting
that requires analysis of a large amount of data related to temperature, pressure
and humidity of various places, etc.
- Accuracy Computer provides a high degree of
accuracy. For example, the computer can accurately give the result of division
of any two numbers up to 10 decimal places.
- Diligence when used for a longer period of
time, the computer does not get tired or fatigued. It can perform long and
complex calculations with the same speed and accuracy from the start till the
end.
- Storage Capability Large
volumes of data and information can be stored in the computer and also
retrieved whenever required. A limited amount of data can be stored, temporarily,
in the primary memory. Secondary storage devices like floppy disk and compact disk
can store a large amount of data permanently.
- Versatility Computer is versatile in nature. It can perform different types of tasks with the same ease. At one moment you can use the computer to prepare a letter document and in the next moment you may play music or print a document.
