Study Materials

Modem: What is a Modem? Types of Modems Modem is abbreviation for Modulator – Demodulator.  Modems are used for data transfer from one computer network to another computer network through telephone lines. The computer network works in digital mode, while analog technology is used for carrying massages across phone lines. Modulator  converts information from  digital mode to analog mode  at the transmitting end and demodulator converts the same from  analog to digital at receiving end . The process of converting analog signals of one computer network into digital signals of another computer network so they can be processed by a receiving computer is  referred to as digitizing. When an analog facility is used for data communication between two digital devices called Data Terminal Equipment (DTE), modems are used at each end. DTE can be a terminal or a computer.   The modem at the transmitting end converts the digital signal generated by DTE into an analog signal by mod

WWW Overview Overview WWW  stands for  World Wide Web.  A technical definition of the World Wide Web is : all the resources and users on the Internet that are using the Hypertext Transfer Protocol (HTTP). A broader definition comes from the organization that Web inventor  Tim Berners-Lee  helped found, the  World Wide Web Consortium (W3C). The World Wide Web is the universe of network-accessible information, an embodiment of human knowledge. In simple terms, The World Wide Web is a way of exchanging information between computers on the Internet, tying them together into a vast collection of interactive multimedia resources. Internet  and  Web  is not the same thing: Web uses internet to pass over the information. Evolution World Wide Web  was created by  Timothy Berners Lee  in 1989 at  CERN  in  Geneva.  World Wide Web came into existence as a proposal by him, to allow researchers to work together effectively and efficiently at  CERN.  Eventually it bec

Web Browser Web Browser web Browser  is an application software that allows us to view and explore information on the web. User can request for any web page by just entering a URL into address bar. Web browser can show text, audio, video, animation and more. It is the responsibility of a web browser to interpret text and commands contained in the web page. Earlier the web browsers were text-based while now a days graphical-based or voice-based web browsers are also available. Following are the most common web browser available today: Browser Vendor Internet Explorer Microsoft Google Chrome Google Mozilla Firefox Mozilla Netscape Navigator Netscape Communications Corp. Opera Opera Software Safari Apple Sea Monkey Mozilla Foundation K-meleon K-meleon Architecture There are a lot of web browser available in the market. All of them interpret and display information on the screen however their capabilities and structure varies depending upon implementation.