3. Way of exchanging information.
Public files on computers can be
read by remote user.
- usually Hyper Text Markup
Language (.html)
A document on the web is called
a Web page , identified by a
unique address called URL.
Uniform Resource Locator (URL)

4. 1989 – 1990 Tim Berners Lee
invents the World Wide Web (www)
at Cern .
Published in 1992
Means for transferring text and
graphics simultaneously
Text mark up language
•Not invented by Bernes-Lee

5. Web pages constructed using HTML.
Clients use browser application to send
URIs via HTTP to servers requesting a Web
page
Servers respond with requested Web
pages or with error message.
Client’s browser renders Web page
returned by server
– Page is written using Hyper Text Markup Language
(HTML)
– Displaying text, graphics and sound in browser

6. Structural Components:
- Clients / browsers.
- Servers.
- Caches.
- Internet.
Semantic Components:
- Hyper Text Markup Language (HTML).
- Hyper Text Transfer Protocol (HTTP).
- Extensible Markup Language (XML).
- Uniform Resource Locator (URL) .

7. The Hypertext Concept :
Hypertext is text which contains link to other texts. The term
was invented by Tin Nelson around 1965.
The Hypermedia
Concept :
Hypermedia is a term used for hypertext which is not
Constrained to be text : it can include graphics , video and sound.
Web Browsers :
A web browsers displays a web document and enables users

8. Web Server :
This is a program that waits patiently for the browsers to
request a web page. The servers looks for the requested information ,
retrieves it and send it to the browser or sends an error message if the
file is not found.
Uniform Resource Locator
(URL) :
These are the web addresses. We type URL in address bar
of the browser then hit on enter then URL request a web pages to the
web server.
Hypertext Markup
Language (HTML) :
• Mark up elements are not seen by the user when page is displayed

9. The two basic steps required in
making a web page.
• Create an HTML File
• Upload file to server
–Saving to P: drive eliminates
this step

10. The internet came first.
Internet and WWW are two
different concepts.
Internet is a global computer
network made up of thousand of
computers & computer network.
WWW is a system that

11. Internet:
o Internet is a global system of interconnected computer network.
o Massive network of networks.
o This computers communicate with each other using a common
protocol (TCP/IP i.e. Transmission Control Protocol / Internet
protocol )
World Wide Web (WWW) :
o WWW is one of the services that run on internet.
o WWW is a system of interlinked hypertext documents accessed via
Internet.
o Way of accessing the information .

12. WWW is a way of exchanging
information.
Tim Berners Lee invents the World
Wide Web (www) at Cern .
WWW is constructed using HTML
There are basic steps to create Web
pages
Internet and WWW are the two
different concept. WWW is one of the