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Introduction

A Computer is an electronic device, which is used for a number of applications ranging

from writing letters to reserve a ticket in a train. A Computer has several components like

Keyboard, Mouse, Processor, Memory, Monitor and printer etc. Computer requires

instructions to perform a particular task. A series of instructions is normally known as a

program. Hardware and Software are the two terms we frequently use with reference to

Computer. CPU, memory and peripheral devices (input and output devices) are generally

Referred to as Hardware whereas compiler. Interpreter and operating system are examples of

Software.

1.1 Objectives

In this chapter you will be learn about

1. Describe the various components of a Computer

2. Distinguish between Hardware and Software

3. Describe Applications of Computer

4. Connect Accessories to Computer

1.2 What is Computer?

Computer derives its name from the word Compute that means calculation. It can be

said that Computer is a device used for calculation. Nowadays Computer is not only limited

to computation, but also used for making phone calls, maintaining databases, listening songs,

viewing movies etc, so a more formal definition of Computer is required. Computer is an

electronic device that processes or transforms data into useful information by executing a

series of predefined instructions.