Computer System

929 Words Apr 1st, 2012 4 Pages
Lesson 1

An Overview of the Computer System

This lesson includes the following sections:

• The Parts of a Computer System

• Looking Inside the Machine

• Software: Bringing the Machine to Life

The Parts of a Computer System

• What is a Computer?

• Hardware

• Software

• Data

• Users

The Parts of a Computer System - What is a Computer?

• A computer is an electronic device used to process data.

• A computer can convert data into information that is useful to people.

• A complete computer system includes four distinct parts:

• Hardware
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The keyboard and mouse are examples of input devices.

• Output devices return processed data back to the user or to another computer system. The printer and monitor are examples of output devices.

• Communications devices (such as modems and network interface cards) perform both input and output, allowing computers to share information.

Looking Inside the Machine - Storage Devices

• Storage devices hold data not currently being used by the CPU. Data is commonly stored on a magnetic or optical disk. Each type uses a special medium for storing data on its surface.

• A disk drive is a device that reads data from and writes data to a disk. Most new computers feature a floppy disk drive, a hard disk drive, and an optical disk drive.

• The most common optical storage devices are CD-ROM and DVD-ROM drives.

Software: Bringing the Machine to Life

• What is Software?

• System Software

• Application Software

Bringing the Machine to Life – What is Software?

• Software is a set of electronic instructions that tells the computer how to do certain tasks. A set of instructions is often called a program.

• When a computer is using a particular program, it is said to be running or executing the
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