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Introduction to Computers A World of Computers What is computer literacy ? Knowledge and understanding of computers and their uses Computers are everywhere What Is a Computer? Processes data into information Data that is organized, meaningful, and useful Accepts data

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a world of computers
A World of Computers
  • What is computer literacy?
  • Knowledge and understanding of computers and their uses
  • Computers are everywhere
what is a computer
What Is a Computer?

Processes data into information

Data that is organized, meaningful, and useful


Raw facts, figures, and symbols

Produces and stores results

  • How is a computer defined?
  • Electronic device operating under the control of instructions stored in its own memory
what is a computer4
What Is a Computer?
  • What is the information processing cycle?
  • Input
  • Process
  • Output
  • Storage
  • Communication
the components of a computer
The Components of a Computer
  • What is an input device?
  • Hardware used

to enter data

and instructions

the components of a computer6
The Components of a Computer
  • What is an output device?
  • Hardware that

conveys information to a user

the components of a computer7
The Components of a Computer


  • What is the system unit?
  • Box-like case




used to process


p. 8 Fig. 1-3

the components of a computer8
The Components of a Computer


  • What are two main components on the motherboard?

Central Processing Unit (CPU)

Also called a processor

Carries out instructions that tell computer what to do


Temporary holding place for data and instructions

p. 8

the components of a computer9
The Components of a Computer
  • What is storage?
  • Holds data, instructions, and information for future use

Storage media

  • Physical material on which data, instructions, and information are stored

Storage device

  • Records and retrieves items to and from a storage medium
the components of a computer10
The Components of a Computer
  • What isstorage media?


Portable, thin memory cards used in:


the components of a computer11
The Components of a Computer
  • What is a floppy disk?
  • Thin, circular, flexible disk enclosed in rigid plastic shell
  • A USB flash drive is portable, and has much greater storage capacity
the components of a computer12
The Components of a Computer
  • What is a flash drive?
  • Provides much greater storage capacity than a floppy disk or Zip® disk
  • Small and lightweight enough to be transported on a keychain or in a pocket
the components of a computer13
The Components of a Computer
  • What is a hard disk?
  • Provides much greater storage capacity than a floppy disk or USB flash drive
  • Housed inside the system unit
the components of a computer14
The Components of a Computer
  • What is a compact disc?
  • Flat, round, portable metal disc
  • CD-ROM
  • CD-RW
  • DVD+RW
why is a computer so powerful
Why Is a Computer So Powerful?






  • What makes a computer powerful?
networks and the internet
Networks and the Internet



Enables a connection between computers

Telephone lines

Cellular radio

One type is a modem

  • What is a network?
  • Collection of computers and devices connected together

Communications Device

Communications Media

networks and the internet17
Networks and the Internet


  • What are the reasons to network?

To share


Hardware devices

Software programs

To save time and money



p. 10

networks and the internet18
Networks and the Internet
  • What is a server?
  • Manages the resources on a network
  • A client accesses the resources on the server
networks and the internet19
Networks and the Internet
  • What is the Internet?
  • Worldwide collection of networks that connects millions of computers
networks and the internet20
Networks and the Internet
  • Why do users access the Internet?
  • Communications
  • Information
  • Shopping
  • Banking and Investing
  • Classes
  • Entertainment
networks and the internet21
Networks and the Internet
  • What is the Web?
  • Billions of documents, called Web pages, available to anyone connected to the Internet

A Web site is a collection of related Web pages

A Web page contains text, graphics, sound, video, and links to other Web pages

You can share information by creating Web pages or posting photos on a photo community

computer software
Computer Software
  • How do you install a software program?
  • A program is a series of instructions that tells the computer what to do
computer software23
Computer Software


  • What is a graphical user interface (GUI)?
  • Allows you to interact with the software using graphics and icons
  • Controls how you enter data and how the screen displays information

p. 14 Fig. 1-14

computer software24
Computer Software
  • What issystem software?
  • Programs that control the operations of the computer and its devices

Operating System (OS)is a set of programs that coordinates all activities among computer hardware devices and allows users to run application software

Utility Programsallow the user to perform maintenance-type tasks usually related to managing a computer, its devices or its programs

computer software25
Computer Software
  • What isapplication software?
  • Programs that perform specific tasks for users

Word Processing



Presentation Graphics

computer software26
Computer Software

Javascript program

Resulting Internet application

  • What is aprogrammer?
  • Someone who developsapplication or system software
  • Programmer writesinstructions todirect computer toprocess data intoinformation
categories of computers
Categories of Computers

Midrange servers


Mainframe computers

Personal computers (desktop)

Mobile computersand mobile devices

What are the categories of computers?

personal computers
Personal Computers
  • PC and compatibles use the Windows operating system
  • Apple Macintosh uses the Macintosh operating system (Mac OS)

Click to view Web Link,click Chapter 1, Click Web Linkfrom left navigation,

then click Personal Computers below Chapter 1


  • What are the two most popular series of personal computers?

p. 19 Figs. 1-18–1-19

personal computers29
Personal Computers


  • What is adesktop computer?
  • Designed so all of the components fit on or under a desk or table

p. 19 Fig. 1-18

personal computers30
Personal Computers
  • What is anotebook computer?
  • Portable, small enough to fit on your lap
  • Also called a laptop computer
  • Generally more expensive than a desktop computer
handheld computers
Handheld Computers
  • What is atablet PC?
  • Resembles a letter-sized slate
  • Allows you to write on the screen using a digital pen
  • Especially useful for taking notes
handheld computers32
Handheld Computers
  • What are Web-enabled handheld computers?
  • Allow you to check e-mail and access the Internet
  • Web-enabled telephone is a “smart phone”
handheld computers33
Handheld Computers

Small enough to fit in your hand

Used by mobile employees such as meter readers and delivery people

  • What is ahandheld computer?
handheld computers34
Handheld Computers
  • What is apersonal digital assistant (PDA)?
  • Provides personal organizer functions
    • Calendar
    • Appointment book
    • Address book
    • Calculator
    • Notepad
  • What types of servers are there?

Midrange serverPowerful, large computer that supports up to a few thousand computers

MainframeVery powerful, expensive computer that supports thousands of computers

SupercomputerThe fastest, most powerful, most expensive computer. Used for applications requiring complex mathematical calculations

elements of an information system
Elements of an Information System
  • What are information system elements?
  • People
  • Procedures
  • Data
  • Software
  • Hardware
examples of computer usage
Examples of Computer Usage
  • What are five categories of computer users?
examples of computer usage38
Examples of Computer Usage
  • What software is available for a home user?
examples of computer usage39
Examples of Computer Usage
  • What software is available for a small office/home office (SOHO) user?
  • Local area network (LAN)
  • Productivity software
  • Specialty software
  • Web usage
  • E-mail
examples of computer usage40
Examples of Computer Usage
  • What is available for a mobile user?
  • Hardware
  • Software
    • Productivity
    • Presentation
    • Personal information manager
examples of computer usage41
Examples of Computer Usage
  • What are the needs of the large business user?

Public kiosk

Web access



Productivity software


examples of computer usage42
Examples of Computer Usage
  • What are the needs of a power user?
  • Speed and large amounts of storage
  • Types of power users
  • Engineers
  • Architects
  • Desktop publishers
  • Graphic artists
computer applications in society
Computer Applications in Society
  • What are some examples of computer applications in society?
  • Education
  • Finance
  • Government
  • Healthcare
  • Science
  • Publishing
  • Travel
  • Industry