Network- Lesson2

Good Morning Students

The Google meet ID link for today's class is :

Meeting ID

meet.google.com/jce-qkkq-doi

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By the end of this session, you will be able to 

• Become familiar with  the basic structure of Internet
• Understand the features of WWW
• Differentiate between Internet and WWW
•  Understand  the basic terminology of Internet (Web server web client, website, webpage, web browser)
• differentiate between types of  Web pages and Web browsers.

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World Wide Web

• Short form WWW.
• Massive collection of interlinked  documents, images and other resources(standard and protocol)
• Invented by Tim Berners Lee in 1989 
• Pages are inter linked to other web pages using hyper links and URLs creating a great web of  information

Features of World wide web(WWW)

• Provides the user facility of quick and easy way  to search for desired information
• Was built on the concept for hyper text 
• HTML pages are created 
• Hyper links to HTML pages are created using special text called hyper links and URLs
• These hyper links appears in different colours than normal text 
• Hyper Text can link information within the same  page, another web page or another web site
• Whenever client request for some page, the web server responds by sending the resource
• Web Browser is used to access the web  
• We can search, retrieve, download and surf any amount of information through any amount of sites
• Helps people to 
• Communicate with each other
• Share information and resources
• It can run on any operating system  You just need to have compatible browser

Difference between internet and world wide web:

	Internet	World Wide Web
Estimated year of Origin	1969, though opening of the network to commercial interests began only in 1988	1993
Abbreviation	NET	www
Comprises	Network of Computers, copper wires, fibre-optic cables & wireless networks	Files, folders & documents stored in various computers
Governed by	Internet Protocol	Hyper Text Transfer Protocol
Dependency	This is the base, independent of the World Wide Web	It depends on Internet to work
Nature	Hardware	Software

WWW Terminology:

1. Web Server- Web server is:
• a powerful computer where the HTML pages and other resources are stored.
• Always active and connected to the internet.
• Runs softwares designed to send out HTML pages and other file formats.
• Based on client-server model.
• web browser in our computers is a client that requests HTML files from web server
• web server processes the request and sends the response back to the client computer
• Server is usually much faster than commonly used computers
• It manages and processes the request of multiple clients 
2. Web Client :
• Is the user side of the web 
• Refers to the web browser in the user's machine
• Client's side components are usually computer applications running on a user's computer and connected to the server
3. Web Site :
• A collection of related web pages
• Has a unique address called URL (Uniform Resource Locator)
• Web sites are hosted on web servers,  the process of storing websites on a web server is called "Hosting"
• Web servers store thousands of individual web pages 
4. HOME PAGE - 
• first page of a website
• while accessing a website we are directed to its home page or main page
• It may be the only or the first page of the website.
5. WEB PAGES
• an electronic page usually written in HTML
• contains information related to the specific topic
• may contain text, images, graphics or hyperlinks.
• WWW consists of a large collection of such interlinked web pages.
• each page has a unique address, known as URL
• Types of web pages-
• Static-
• cannot be changed by the user
• these are read only pages and shows same information till the programer changes the source code.
• these are simplest pages created using standard HTML tags
• Dynamic-
• interactive
• can produce different content for different users according to their requirements.
• uses other languages like PHP,JSP etc. along with HTML tags..
6. WEB BROWSER
• is a software application which enables a user to display and interact with text, images, sound and other information on the web pages.
• client is known as a web browser.
• Types-
• Graphical Browsers- 
• displays text, images,sound, and hyperlinks
• accessed by pointing and clicking on them with a mouse.
• Example- Edge, Google Chrome, Mozilla Firefox etc.
• Text Only Browsers-
• does not support images and sound
• purely text based
• User can interact with application by making use of commands and only one task can run at a time.
• Example- Lynx browser running on Unix Shell
7. BLOGS
• derived from the term Weblog
• is a type of website usually maintained by an individual.
• person who writes a blog is called blogger.
• combines text, images and links to other blogs, webpages and other media.
• types:-
• personal
• corporate
• moblog
• Example- Blogger.com