The document discusses the Internet and the World Wide Web. It defines the Internet as a global network of computers and the World Wide Web as a global, computer-based network of information and resources accessed through the Internet. It describes how information is stored on servers and accessed by clients using protocols like HTTP. It also outlines different types of Internet access, how browsers display web pages, common web page components like HTML, and types of websites.

1. The Internet
and the
World Wide Web

2. What is the Internet?
>>> the Internet is a global network of
computers
>>> Network - connection of several
computers for the purpose of sharing
resources and data
>>> Intranet - a private network for
information management and sharing
among only its members or employees

3. What is the
World Wide Web?
>>> or simply “the Web”, is a
global, computer-based network of
information and resources that can
be accessed through the worldwide
network of computers known as
the Internet

4. Internet vs WWW
>>> the Internet is the highway system
>>> the Web is the package delivery
service that uses the highway

5. How does it work?
>>> all computers in the web can
communicate with each other using
the communication standard called
HTTP (HyperText Transfer
Protocol)

6. How does it work?
Client/Server Architecture
• Information is stored on
computers called Web servers
• Computers reading the
information are called Web clients

7. How does it work?
>>> Internet Service Providers
(ISPs) - businesses that provide
individuals and companies with the
means to connect to the internet
e.g. sky cable, home cable, aol…

8. How does it work?
2 Types of Internet Access
• dedicated - 24/7 connection
e.g. DSL, cable
• dial-up - uses a device called a
telephone modem. It connects to
the internet through existing phone
lines

9. How does it work?
Web Page vs. Web Site
• Web information is stored in
documents called Web pages
• Web pages are clustered as
Web sites

10. How does it work?
Browsers
• Web clients view the pages with a
program called a Web browser
e.g.
Internet Explorer and Netscape
Navigator

11. How does the browser
fetch Web pages?
>>> through a request
>>> a standard http request contains
a web page address or url (uniform
resource locator)
e.g.
http://www.homepage.com/page.html

12. How does the browser
display the Web pages?
• All Web pages contain
instructions for display
• The browser displays the page by
reading these instructions

13. How does the browser
display the Web pages?
• The most common display
instructions are called HTML tags
• HTML tags look like this:
<p>This is a Paragraph</p>

14. Who is making the
Web standards?
>>> not Microsoft or Netscape
>>> The rule-making body of the Web
is the W3C (World Wide Web
Consortium)
>>> The most essential Web standards
are HTML, CSS and XML

15. What are the types of
Web Sites?
• Personal: promote oneself and
services offered
• Organization/Topical: promote
member accomplishments or
encourage support and participation/
talk about a specific theme/topic

16. What are the types of
Web Sites?
• Commercial: promote and sell
products online
• Search Services: search engines
and directories

17. What are the types of
Web Sites?
• Portals: offer a wide array of
services, such as e-mail, forums,
search engines, and on-line
shopping malls

18. What are the other
types of Internet
Applications?
>>> email, newsgroups/egroups,
Telnet, IP-telephony, peer-to-
peer, ftp (file transfer protocol),
instant messaging, chat, video
conference, etc…

19. The Impact of the Internet
• Communication
• Business
• Education
• Entertainment
• and so much more…