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3.2.2 World Wide Web (Web Browser & Web Address)(Webpage…
3.2.2 World Wide Web
(Web Browser & Web Address)(Webpage Navigation)(Web Searching)
World Wide Web
consists of a worldwide collection of
electronic documents (or Webpages)
Web Page and Web Site
Web site is a collection of related Web pages
and associated items such as documents and
pictures, stored on a Web server
Web page refers to an electronic document on
the Web which can contain text, graphics,
animation, audio, and video
Web Server and DNS Server
Web server is a computer that stores Web
pages and delivers requested Web pages to
user’s computer
DNS server is a computer that translates the
domain name to its associated IP address
Web Browser
Web browser is an application software that
allows users to access and view Web pages
When a user click or start a Web browser it
will display the first page of a Website called
home page.
Examples of Web browser:
– Google Chrome
– Mozilla Firefox
– Internet Explorer
– Opera
– Saf
How a Web Browser Displays a Home Page
User clicks Web browser icon.
Web browser looks up for its home page setting.
Web browser communicates with DNS server,
which translates the domain name of home
page to IP address and then sends IP address to
user’s computer.
Web browser uses the IP address to request the
home page from the Web server associated with
the home page.
The web server sends the home page to Web
browser, which then displays it on the screen
Hyperlink
hypertext
• Refers to text which contains link to other text.
• Mostly used in text-based Web page such as
Wikipedia
or Link is built-in connection to
another related Web page or part of a Web
page.
hypermedia
• Refers to text or image that contains link not
only to text, but also to other forms of media
such as graphic, audio and video.
• Combines text-based links with graphics,
audio, and video links.
Web Address
a unique address for a Web
page
Also called a Uniform Resource Locator (URL)
• Examples of Web address:
–
http://www.malaysia.gov.my/BM/Pages/default.a
spx
–
http://www.facebook.com
Components of Web Address
• Protocol
• Domain Name
• Path
• Web Page Name
• Protocol
– A set of rules that defines how pages transfer on
the Internet.
Types of protocol:
– http (Hypertext Transfer Protocol)
a standard set of rules that defines how pages
transfer on the Internet.
– https (Hypertext Transfer Protocol Secure)
a protocol for secure communication over a
computer network
• Domain name
– Address of the computer that contains the Web
site (IP address)
Path
– Directories or folders that contains the files being
accessed
• Web Page Name
– the name of the file that is being accessed
Search Tools
a program available on the
Internet to help you find information among
the millions of documents on the Web
Search Engine
User can find Web page or information by
typing a word or phrase, called search text, in
the text box provided
search tool that finds Web
sites, Web pages, images, and other
information related to a specific topic
• Used in locating information for which you do
not know an exact Web address or are not
seeking a particular Web site
Subject Directory
User can locate Web page or information by
clicking the links through different levels,
moving from the general to the specific.
Subject directory is a search tool that classifies
Web pages in an organized set of categories
and subcategories
text**
Examples
• Google (
http://www.google.com
)
• Yahoo! (
http://www.yahoo.com
)
• MSN (
http://www.msn.com
)
• Gigablast (
http://www.gigablast.com
)
• Excite (
http://www.excite.com
)
• Open Directory Project (
http://www.dmoz.org
)
These search tools offer the functionality of
both a search engine and a subject directory
