WWW & INTERNET!
WWW is a system of interlinked, hypertext documents accessed via the Internet. It was created in 1989 by Sir Tim Berners Lee, working at CERN in Geneva, Switzerland. The WWW is a system of Internet Servers that support specially formatted documents. The documents are formatted in a markup language called HTML that supports links to other documents, as well as graphics, audio and video files.
Video Presentation on the The History of Internet
With a Web Browser, user views web pages that contain text, images, videos and other multimedia and navigates between them, using hyperlinks. There are several Web Browsers available now days; two of them are Netscape Navigator and Microsoft Internet Explorer. The Internet and WWW are not one and the same but two separate but related things.
The Internet is a massive network of networks, a networking infrastructure. It connects millions of computers together globally, forming a network in which any computer can communicate with any other computer as long as they are both connected to the Internet. Information that travels over the Internet does so via a variety of language known as Protocols.
Video Presentation explaining TCP/IP Model of Communication
The WWW, or simply Web, is a way of accessing information over the medium of Internet. It is an information sharing model that is built on top of the Internet. The Web uses HTTP protocol to transmit data over the Internet. The Web also utilizes browsers, such as IE or Netscape to access web documents called web pages that are lined to each other via hyperlinks.
The Web is just one of the ways that information can be disseminated over the Internet. The Internet is also used for E-Mail, which relies on SMTP, Usenet Newsgroups, Instant Messaging and FTP. So, the Web is just a portion of the Internet.
Video Presentation on the Working Principle of Internet!
Local Server and Remote Server:
A web server is a computer program that is responsible for accepting HTTP requests from clients (known as web browsers), and serving them HTTP responses along with optional data contents, which usually are web pages such as HTML documents and linked objects (images etc.).
A host is a computer, which is connected to a network. Local host is a machine which is connected in a Local Area Network (LAN). A computer connected to a LAN can be accessed using its unique ID within the network. It is done with the help of the ID available in the Network Interface Card (NIC). Hence, to access a web page available in a local host, we can use either the host name or the host ID.
A remote host is a machine, which is connected to another network in the internet. To access a remote host, we need two names: a domain name and a host name. The domain name is a name that refers to a geographical area or the type of organization or business to which the particular host belongs to. But, the host name identifies the computer that host the web server within the specified domain.
Presentation that distinguishes the term Internet and WWW
Domain Name and IP Address:
A domain name represents a group of host on the Internet. It combines with a host name and a Top-Level Domain (TLD) to form a fully qualified host name. It provides a user-friendly approach to identify a site on the Internet. The TLD often describes the domain area, which may be one of the following:
.com - refers to a commercial business
.org - refers to a non-profit organization
.cn, .et, .om, .us, .in - refers to a country (called country domain)
Each fully qualified host name is assigned a unique address called an IP Address, which actually identifies a particular computer on the Internet. A Domain Name Server (DNS) is a computer that maintains a database of host names and their corresponding IP addresses, and translates the fully qualified host name to an IP address. The translation operation is referred to as a DNS lookup. For e.g., the web address www.deitel.com is translated into an IP address of the Deitel web server (i.e., 207.60.134.2300.
