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INFORMATION RETRIEVAL   It is the process of accessing information that is stored on the Internet. The process of exploring and retrieving the information from the Internet is known as net surfing. When your PC is connected to the Internet, you are ready to retrieve information from it. You need a particular software called Web browser to retrieve information.   When you type the URL of a particular Website in the address bar of the Web browser and press Enter key, the browser retrieves the Web page from the Internet and stores its content. SEARCH ENGINE   It is a Website that provides the required data on specific topics. It turn the Web into a powerful tool for finding information on any topic. Search engine allows users to enter keywords (queries or terms) related to particular topics and retrieve information about the Websites containing these keywords. It is a program designed to search for information on the Web through a database of Web pages queries or keywords.   When search

Communication : - In the past, people used to communication through letters, telephones etc. The advent of computers has made it possible to share or exchange information in real time (instant). Information can be textual, graphics or visual from any corner of the world in different ways. Like – Email, Online chatting, Video conferencing, FTP (File Transfer Protocol), Telnet, Social Networking. News & Broadcasting : The delivery and reception of news has changed dramatically with the advent of computers. Earlier, Journalists used snail mail, reel-to-reel recorders, dark-room processing for photos and typewriters for composing contents. But now computers have facilitated in Instant Broadcast, Online Newspapers, Online News Channels, etc. Social Networking: Before the advent of computer, people used to interact with friends and relatives in closed groups and meet them during family functions, religious ceremonies and gatherings at local temples, gurudwaras, mosques or church

 Media Of Communication Communication Channel :-Medium of communication can broadly categorized into two types:-  1. Guided Media : - Guided media are those, which provide a physical connection from one device to another device. Like:- (a) E thernet Cable : - Ethernet is a data link technology used in local Area network. Such cable can transmit data speed of 100-1000 mbps. .Ethernet Cable was invented by an electrical Engineer of U.S. named Robert Metcalf. .Ethernet Cable connected to Ethernet port with the help of “RJ45” socket. Ethernet Cable can be categorized into:-  1.Straight through Ethernet Cable:- It is used to connect different devices. Like:- Computer to hub         Computer to switch         Computer to router It has same order of color form left to right. 2.Ethernet Crossover Cable:- It is used to connect same device. Like:- computer to computer          Router to router            Hub