ICT-Lecture-01a Hardware software.ppt

Understanding Computers: Today and Tomorrow, 13th Edition
1
Data vs. Information
• Data
– Raw, unorganized facts
– Can be in the form of text, graphics, audio, or
video
• Information
– Data that has been processed into a meaningful
form
• Information processing
– Converting data into information

2
Computers Then and Now

3
Hardware

4
Software
• Software: The programs or instructions used to tell
the computer hardware what to do
– System software: Operating system starts up the
computer and controls its operation
• Without OS computer cannot function
• Boots the computer and launches programs at
the user’s direction
• Most use a GUI to interact with the user via
windows, icons, menus, buttons, etc.
• Windows, Mac OS, Linux, etc.

5
Software

6
Application Software
– Application software: Performs specific tasks or
applications
• Creating letters, budgets, etc.
• Managing inventory and customer databases
• Editing photographs
• Scheduling appointments
• Viewing Web pages
• Sending and receiving e-mail
• Recording / playing CDs/DVDs
• Designing homes
• Playing games

7
Software

8
Computer Users and Professionals
• Computer users (end users): People who use a
computer to obtain information
• Computer professionals include:
– Programmers
– Systems analysts
– Computer operations personnel
– Security specialists

9
Quick Quiz
1. A tablet PC is an example of a(n) _____________.
a. Desktop computer
b. Portable PC
c. Internet appliance
2. True or False: The terms mainframe computer and
supercomputer are interchangeable; both refer to the
largest, most powerful computers.
3. A smartphone is an example of a(n) _____________.

10
Computer Networks and the Internet
• Computer network: A collection of hardware and
other devices that are connected together.
– Users can share hardware, software, and data
– Users can communicate with each other
• Network servers: Manage resources on a network
• Clients: Access resources through the network server
• Computer networks exist in many sizes and types
– Home networks
– School and small business networks
– Large corporate
– Public wireless networks
– The Internet

11
Computer Networks and the Internet

12
What Are the Internet and the
World Wide Web?
• Internet: The largest and most well-known computer
network in the world
• Individuals connect to the Internet using an Internet
service provider (ISP)
• World Wide Web: One resource (a vast collection of
Web pages) available through the Internet
– Web sites contain Web pages stored on Web
servers
– Web pages viewed using a Web browser (Internet
Explorer, Chrome, Safari, Firefox, Opera, etc.)
• A wide variety of information is available through the
Web

13
What Are the Internet and the
World Wide Web?

14
Accessing a Network or the Internet
• Need a modem or network adapter
• Some networks require a username and password
• Internet connections can be:
– Direct (always-on) connections
– Dial-up connections
• Internet addresses are used to access resources on
the Internet
– IP address: Numeric address that identifies computers
(207.46.197.32)
– Domain name: Text-based address that identifies
computers (microsoft.com)
– Uniform resource locator (URL): Identifies Web pages
(http://twitter.com/jobs/index.html)
– E-mail address: Identifies people for e-mail exchange
(jsmith@cengage.com)

15
IP Addresses and Domain Names
• IP addresses are numeric and
unique
• Domain names: Correspond to
IP addresses
– Top-level domains (TLDs)
identifies type of organization
or its location
– Custom TLDs may soon be
allowed

16
Uniform Resource Locators (URLs)
• URL: Uniquely identifies a Web page
– Consists of:
• Protocol or standard being used
• Identification of the Web server
• Names of folders in which the Web page file is
stored
• Web page’s filename
• Protocols:
– Hypertext Transfer Protocol (http://) is typically
used to display Web pages (https:// is used for
secure Web pages)
– File Transfer Protocol (ftp://) is often used for file
exchange

17
Uniform Resource Locators (URLs)

18
E-Mail Addresses
• E-mail addresses consist of:
– Username: A person’s identifying name for a
particular domain
– The @ symbol
– Domain name for the computer that will be
handling the person’s e-mail (mail server)
• Pronouncing Internet addresses

19
Surfing the Web
• Web browser: Used to display Web pages
• Browser starting or home page: The first page
displayed when the browser is opened
• To navigate to a Web page, you can:
– Type a URL in the Address bar
– Click a hyperlink on a displayed Web page
– Select a Favorite/Bookmark or page from the
History list

20
Surfing the Web

21
Searching the Web
• Search site: Web page that helps you find Web
pages containing the information you are seeking
– Typically search using keywords
• Reference sites:
Look up addresses,
telephone numbers,
ZIP codes, maps,
etc.

22
E-Mail
• Electronic mail (e-mail):
electronic messages
exchanged between
computers on a
network
– Can be conventional
or Web-based
– Can contain photos,
attached files, etc.

23
Computers and Society
• The vast improvements in technology over the past
decade have had a distinct impact on daily life, both
at home and at work
• Many benefits of a computer-oriented society:
– Ability to design products before construction
leads to safer products
– Earlier medical diagnoses
– Devices that allow challenged people to perform
job tasks
– Documents e-mailed or faxed in moments
– Download information, music, programs, movies,
and more on demand

Computers and Society
• Computer-oriented society also has risks
– Computer viruses and malware
– Identity theft and phishing
– Privacy issues
• Differences in online communications
– Less formal than traditional
– Netiquette
– Emoticons
• The anonymity factor
• Information Integrity
– Check your source, not all information on the Internet is
accurate.

ICT-Lecture-01a Hardware software.ppt

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