By

Prof. Manikandan.R

Dept of Computer Application

Qaide Milleth College - Chennai

Definition of Computer What does it Do? Computer Hardware Computer Software Computer Input Devices Computer Output Devices Computer Storage Devices Types of Computer Computer Networks

Computer is an programmable electronic machine.

An Electronic Device with the ability to:Accept User data and Instructions.

Perform Arithmetic and Logical Operations.

Output the Result.

Store data and Instructions.

1. Computer Hardware

2. Computer Software

Computer Hardware is the physical part of the computer system, the machinery and equipment.

Parts of the computer “you can see”

Computer Software are programs that tell the computer what to do.

Examples

Microsoft Word-word processing program

Microsoft PowerPoint-presentation program

Microsoft Excel-work book program used to track, calculate, and analyze numeric data

Computer Devices that input information in the computer

Examples

Key Board

Mouse

Scanner

Digital Camera

Bar Code Reader

Microphone

Computer Devices that output information from the computer.

Examples

Monitor

Printer

Projector

Speakers

Storage devices◦ Used to store data on or access data from storage

media

Example◦ Hard drives

◦ DVD / CD disks

◦ USB flash drives

◦ Floppy Disc, etc.

Hard Drive

DVD / CD Disks

Floppy DiskPen Drive

Types of Computers

The categories of computers are:

Personal or microcomputers

Desktop

Notebook, Laptop, Table PC

Hand-help or PDAs

Mainframes

Supercomputers

• Personal computers or Micro Computer are used for general computing tasks.

Micro Computer Desktop Computer Laptop Computer

• Hand-held computers fit in the palm of your hand and run

on batteries.

• Also PDA Called(Personal Digital Assistant).

• Mainframes are used by companies to provide centralized storage, processing, and management for large amounts of data.

Supercomputers are the largest and fastest of computers, and can process an enormous volume of data.

Two or more computers and other devicesthat are connected, for the purpose ofsharing data and programs.

Types of Computer Network

Personal Area Networks (PAN)Local Area Networks (LAN)Metropolitan Area Network (MAN)Wide Area Network (WAN)

Computer Network

IrDA

USB

Bluetooth

Firewire

A Typical PAN

LAN CONNECTION

•It connects hundreds of computers, and the distance is up to afew kilometers.

Metropolitan area network (MAN):

•It connects thousands of computers in a metropolitan area within a distance of hundreds of kilometers.

Wide area network (WAN):

•It connects tens of thousands of computers distributed throughout a country or the world at a typical distance of thousands of kilometers.

Thank you…

Definition of Computer

What does it Do?

Computer Hardware

Computer Software

Computer Input Devices

Computer Output Devices

Computer Storage Devices

Types of Computer

Computer Networks

Max Marks : 40 Sub Date : March 15th