Question of the Day

Are “Internet” & “World Wide Web” the same thing ? 

The Answer…

•No they are not the same thing !

•The Internet is to the World Wide Web 

•or Asia is to Pakistan

•One is the container, the other is an item within the container.          

Concept 1:The Big Infrastructure

•The "Internet“  (or "Net" for short) is a massive public broadcast medium founded in the 1960's. 

Internet

•Internet is a global network of computers.

•Because it is global nobody (company or government owns it)

•Each computer has a unique IP address in the form of nnn.nnn.nnn.nnn

•Each nnn is a number from 0 to 255

•IP stands for Internet Protocol

Concept 2: Protocols – The Language of Sub-networks

•Every sub-network on the Internet is founded upon a specific digital language called a "protocol".

•These many protocols are invisible to you and me, but are crucial for behind-the-scenes document transmission.

Each protocol achieves a specialized goal. 

Protocols

•These different sub-network protocols include:

•Hypertext Transfer Protocol (HTTP)

•Secure Hypertext Transfer Protocol (HTTP s or SSL)

•Email (SMTP, POP, IMAP – Even  HTTP!)

•File Transfer Protocol (FTP)

•Internet Relay Chat (IRC)

•Instant Messaging (IM)

•Telnet (TELNET)

•Network News Discussion Groups(NNTP)

•P2P Networking (P2P)

Transmission Control Protocol/Internet Protocol (TCP/IP), which binds all of the above protocols together. 

Concept 3: Each Sub-network Requires a Special Software

•To browse the World Wide Web, you need one basic HTTP software product: a "web browser" like Microsoft IE, Google Chrome.

•To experience the other protocol networks, you will need additional software like MSN Messenger, Netscape News Reader, FTP Voyager, Azure's Torrent client, and others.

World Wide Web

Components of a Web Application

•Web applications are a type of client/server application

•In a client/server application, a user at a client computer accesses resources on a server computer

•For a web application, the client and server computers are connected via the Internet.

•Web browser provides the user interface for the application

•Web applications run on a server computer under the control of web server software (IIS or Apache)

Static Websites

“Static” – the contents don’t change (unless they’re edited).

Web pages (text files) and other needed files (e.g.

     images) are stored as files on the web server and are 

     as needed in response to HTTP requests

Dynamic Websites

Does not have web pages stored on the server in the same form as the user will view them. Instead, the web page content changes automatically and/or frequently based on certain criteria.

The main purpose behind a dynamic website is that it is much simpler to maintain a few web pages plus a database than it is to build and update hundreds or thousands of individual web pages and links.

•There are two ways to create dynamic web pages:

•Use client-side scripting to change interface behaviors within a specific web page, in response to mouse or keyboard actions or at specified timing events. In this case the dynamic behavior occurs within the presentation (JavaScript , Vb-script & Action Script),

•Use server-side scripting to change the supplied page source between pages, adjusting the sequence or reload of the web pages or web content supplied to the browser. Server responses may be determined by such conditions as data in a posted HTML form, parameters in the URL, the type of browser being used, the passage of time, or a database or server state (PHP, Perl, ASP ASP.NET, JSP).