WWW & INTERNET!
World Wide Web (WWW) is a system of Internet Servers that support specially formatted documents (called hypertext 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. The World Wide Web was created in 1989 by Sir Tim Berners Lee, working at CERN in Geneva, Switzerland.
The WWW, or simply Web provides a way for accessing any information over the medium of Internet. It is an information sharing model that is built on top of the Internet. It allows computer users to locate and view multimedia based documents (i.e., documents containing text, graphics, animation, audio and video) on almost any subjects. It uses HTTP protocol to transmit data over the Internet.With a Web Browser (client web application), user can view the web pages that contain text, images, videos and other multimedia and navigates between them, using the hyper links. There are several Web Browsers available now days; two of them are Netscape Navigator and Microsoft Internet Explorer.
Internet:
The Internet is a global and grand computer network, called the network of networks. It is a global TCP/IP-based network. 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 connected to the Internet.
Through Internet, we can link a large number of autonomous systems, intranets, LANs, MANs and WANs. No organization owns and controls it. But, it operates in the public domain. The information that travels over the Internet does so via a variety of language known as Protocols.
Intranet:
An intranet links a number of autonomous systems of an organization. It differs from the Internet in following ways:
- Though the protocol and technology used for Intranet is reasonably similar to that of the Internet, the access is not public.
- The intranet can, by appropriate tools, facilitate audio and video conferencing, file sharing and transfers. It also employs software tools for authentication, access control, secure transmission, disaster recovery and virus protection.
Intranet & WWW:
The Internet refers to the hardware and the media used for forming a Wide Area Network. Communication between two computers connected in the Internet takes place via a variety of protocols such as TCP/IP.
On the other hand, WWW is just one of the ways that information can be disseminated over the Internet. Some of the other services provided on the Internet are: E-Mail, Instant Messaging and File Sharing. So, the Web is just a portion of the Internet.
Web Site & Web Portal:
A web site is a document in the hypertext form. It possesses text, files, databases, voice clips, video clips, etc. It is used as an access point to other sites in the Internet. The web has now over one million web sites and over 1.4 billion web pages.
A web portal is a web site that hosts on a huge web server. It has a large knowledge base. Its presentation is artistic. It has a specific theme and aim. It offers the usual services like Site Document service, Search facility, E-Mail service and User Registration etc.
The major difference between a web site and a web portal is that a web site provides services to all, whereas a web portal provides Internet services to a specific group of users, for instance, students, job-seekers, doctors, music-lovers and health cautious persons.
Services available on the Net:
Presently, many services are available through the Internet. Some of them are as follows:
- E-Mail
- World Wide Web
- FTP and Anonymous FTP
- Telnet
- News and USENET
- The Gopher
- Wide Area Information Service (WAIS)
- Internet Relay Chat (IRC)
- VOIP
- WAP
- Web Casting of Video and
- E-Com
