01 introduction to internet i
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01.Introduction to Internet-1
By
Waruna Lakmal
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What is Internet
“A communication network of computer networks which operates world-wide that exchanges data, news and opinions etc.”
It started with four interconnected computers in 1969 and was known as ARPANET (Advanced Research Projects Agency NET).
Today Internet connects every university, government, and research facilities in the world including many commercial sites.
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What is Internet
The Internet;Is a source of informationIs a means of communicationIs a medium through which to conduct businessIs a source of getting funand many more…
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History of the Internet
How did the Internet originate?
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History of the Internet
Who controls the Internet? No onec—cit is a public, cooperative, and
independent network Several organizations set standards
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Internet Usage
http://www.internetworldstats.com/stats.htm
http://www.internetworldstats.com/asia/lk.htm
http://en-us.nielsen.com/rankings/insights/rankings/internet
http://www.mit.edu/~mkgray/net/
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Internet Growth Trends
1977: 111 hosts on Internet
1981: 213 hosts
1983: 562 hosts
1984: 1,000 hosts
1986: 5,000 hosts
1987: 10,000 hosts
1989: 100,000 hosts
1992: 1,000,000 hosts
2001: 150 – 175 million hosts
2002: over 200 million hosts
By 2010, about 80% of the planet will be on the Internet
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No. of Participating Hosts Oct. ‘90 - Apr. ‘98
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Domain Name Registration Jan. ‘89 - Jul. ‘97
April 2001: 31,000,000 Domain Names!!!
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Growth of Internet Hosts *Sept. 1969 - Sept. 2002
0
50,000,000
100,000,000
150,000,000
200,000,000
250,000,000
Time Period
No
. of
Ho
sts
The Internet was not known as "The Internet" until January 1984, at which timethere were 1000 hosts that were all converted over to using TCP/IP.
Chart by William F. Slater, III
Sept. 1, 2002
Dot-Com Bust Begins
Copyright 2002, William F. Slater, III, Chicago, IL, USA
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The Internet Host Count in Real-time on September 1, 2002 - Over 204,000,000 IP Hosts!!!
Chart showing Internet Growth from Sept. 1, 2001 to Sept. 1, 2002.
Source Netsizer.com
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History of the Internet
Who controls the Internet?
World Wide Web Consortium (W3C) Oversees research, sets standards and guidelines
Mission is to contribute to the growth of the Web
Nearly 400 organizations around the world are members of the W3C
No onec—cit is a public, cooperative, andindependent network
Several organizations set standards
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The Internet
What are some services found on the Internet?
1. Electronic Mail
2. WWW Service
3. Chat and Video conferencing
4. News Groups
5. File Transfer
etc
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The World Wide Web
What is the World Wide Web (WWW)?
A worldwide collection of electronic documents
Each electronic document is called a Web page
Also called the Web
Can contain text, graphics, sound, video, and built-in connections
A Web site is a collection of related Web pages
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The World Wide Web
What is a Web browser?
MicrosoftInternetExplorer
NetscapeFirefox
Program that allows you to view Web pages
Opera Safari
What are the features of web browsers?
GoogleChrome
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The World Wide Web
What is a home page? The first page that a Web site presents Often provides connections to other Web pages
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The World Wide Web
How do handheld computers and cellular telephones access the Web?
Use a micro browser that displays Web pages that contain mostly text
Must be Web-enabled
WAP/GPRS
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The World Wide Web
What is downloading? The process of a computer receiving information Depending upon connection speed, downloading can
take from a few seconds to several minutes/hours
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The World Wide Web
What is a URL?
Unique address for a Web pageA web server delivers the Web page to your computer
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The World Wide Web
What is a hyperlink (link)?
Item found elsewhere on same Web page
Different Web page at same Web site
Web page at a different Web site
Built-in connection to another related Web page location
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The World Wide Web
What is a search engine? Program used to find Web sites and Web pages by
entering words or phrases called search text Also called a keyword
Search Engine Usage
60%17%
13%
4%6%
Google Yahoo MSN AOL Others
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Advocacy Blog WikiSocial
NetworkContent
AggregatorPersonal
Portal News InformationalBusiness/
MarketingEducational Entertainment
The World Wide Web
Basic types of Web sites?
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The World Wide Web
Basic types of Web sites? Portal News Informational Business/marketing Educational Entertainment Advocacy Personal
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The World Wide Web
What is a portal? A Web site that offers a variety of services from one,
convenient location, usually for free Searching, sports, e-mail,
news, weather, auctions, Web communities (Web sites that join people with similar interests)
Eg; www. Yahoo.com
www.wow.lk
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The World Wide Web
What is a news Web site? Contains newsworthy material Stories and articles relating to current events, life,
money, sports, and weather
Eg: www.lankadeepa.lk
www.dailynews.lk
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The World Wide Web
What is an informational Web site? Contains factual information Created by organizations and government agencies
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The World Wide Web
What is a business/marketing Web site? Contains content that promotes products Allows you to purchase products or services online
Eg; www.sampath.lk
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The World Wide Web
What is an educational Web site?
Some companies offer online training for employees
Some colleges offer online classes and degrees
Offers avenues for formal and informal teachingand learning
Source: www.howstuffworks.com
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The World Wide Web
What is an entertainment Web site? Offers an interactive environment featuring music,
video, sports, games, and more
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The World Wide Web
What is an advocacy Web site? Contains content that describes a cause, opinion,
or ideaEg; www.petition.com
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The World Wide Web
What is a Web Blog?
A blog (a contraction of the term "Web log") is a Web site, usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.
Many blogs provide commentary or news on a particular subject; others function as more personal online diaries.
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The World Wide Web
What is a Content Agregator?
A content aggregator is an individual or organization that gathers Web content (and/or sometimes applications) from different online sources for reuse or resale.
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The World Wide Web
What is a Wiki?
A wiki is a page or collection of Web pages designed to enable anyone who accesses it to contribute or modify content
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The World Wide Web
What is a personal Web site? Web page maintained by private individual Reasons: sharing life experience with the world
or job hunting
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What is HTML?
Hypertext Markup Language is the authoring software language used on the Internet's World Wide Web. HTML is used for creating World Wide Web pages
How do we create interactive multimedia web pages
No need to know HTML
Microsoft Word
Macromedia Dreamweaver
Microsoft FrontPageetc... .
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Q & A ?
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Thank you…