WORLD WIDE WEB ( WWW ) , SERVER AND BROWSER

WWW ( world wide web )

·        World wide web is an architectural framework for accessing linked documents called web pages that are spread over thousand of computers all over the world.

·        WWW is a set of programs, standards and protocols that allow the text, images, animations, sounds and videos to be stored, accessed and linked together in form of web sites.

·        The WWW project was developed at CERN, the European Center for Nuclear Research in 1989.

·        It has a unique combination of flexibility, portability, and user-friendly features that distinguishes it from the other services provided by the internet.

CLIENT OR BROWSER

·        A browser is a piece of software that enables us to display and see the web pages.

·        It acts as an interface between the user and the world wide web.

·        Browsers are also referred to as web clients because in the client server model, the browser functions as the client program.

·        Several different browsers like internet explorer, Mozilla firefox are available that enable us to view these web pages.

·        Each browser consists of three parts:

1.      Controller

2.      Client protocol

3.      Interpreters

·        The browser acts on behalf of the user and does the following:

1.      Contact a web server and sends request for information.

2.      Receives the information and then display it on the user`s computer.

·        The controller receives the input from the keyboard or the mouse and uses the client program to access the document. After the document has been accessed, the controller uses one of the interpreters to display the document on the screen.

·        The client program can be one of the protocols such as HTTP, FTP and Telnet.

·        The interpreter can be HTML, java or javaScript depending upon the type of document.

SERVER

·        Web server is a powerful computer that contains the information in form of web sites.

·        A server is usually attached to internet and provides the requested information to the clients. Each time a client request arrives, the corresponding document is sent to the client.

·        Such a computer usually has a unique address on the network through which it is accessible to all the computer in the internet.

·        This a web server is a place where the actual web site is created, stored and accessed from.

·        To improve the efficiency, servers normally store requested files in cache in the memory.

·        These servers usually use multithreading or multiprocessors in order to answer more than one request at a time thereby improving the efficiency.