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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....

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 comp...

 C ommunication:- Communication means to establish link   between places or people to share information and resource.     Or,      Communication is the process of   transferring a message from one point   to another.     There are three   basic elements of any communication system :-    1.   Sender – A sender that creates and       sends a message.    2.   Medium – A medium that carries the       message.    3.   Receiver – A receiver that receives     the message.     Network :- Network refers to inter-connected group of people object, computers etc., which can exchange information and resources among themselves.   Advantage of Network    1.   Sharing of Files:- Networking enables   to share files among different nodes   or  wo...

CONNECTING TO THE INTERNET There are mainly three ways of connecting to the Internet, which are as follows:      1.     Dial-up Connection       It is a temporary connection, set-up between your computer and ISP server. Dial-up connection uses the telephone line (Public Switched Telephone Network-PSTN) and modem to connect to the Internet. The modem connects the computer through the standard phone lines, which serves as the data transfer medium. When a user initiates a dial-up connection, user need to enter the password and specify a username and modem dials a phone number of an Internet Service Provider (ISP) that is designated to receive dial-up calls. The ISP then establishes the connection, which usually takes about 10 sec and is accompanied by several beeping and buzzing sounds. 2. Broadband Connection The term broadband commonly refers to high speed Internet access that is always ON and faster than the traditional d...

Computer Function A computer performs action and accomplishes its task in three basic stages namely:- INPUT – Input is the data that is fed into the computer by the user. PROCESS – Processing refers to the series of action by which the computer converts raw data into information. OUTPUT – Output is the result which is termed as information. Input Unit Data and instructions enter a computer through an input unit in a form that depends upon the input device used. Ex- Keyboard, Mouse, Joystick, Scanner etc. CENTRAL PROCESSING UNIT (C.P.U) CPU is also known as the brain of the “Brain of Computer”. As it appears as a hardware component, but it is also a functional component of a computer system. Functional Elements of a CPU        1.        Arithmetic Logic Unit(ALU)        2.        Control Unit(C.U)        3.    ...

HTML(Hyper Text Markup Language) HTML is a markup language that is used to publish web pages. Technicallly, it is not a programming language but it was developed to display the content in required format on the website. WEB PAGE A web page is an electronic document of information that can be accessed through aweb browser. It is created using HTML (HyperText Markup Language).   It is generally contained in a website that floats in the world wide web. Web pages may be retrieved from  a local host computer or from a remote computer with the help of internet. WORLD WIDE WEB (WWW) It is a system of Internet servers that supports hypertext and multimedia to access several Internet protocols on a single interface. It is often abbreviated as the Web or WWW. It is a way of exchanging information between computers on the Internet, trying to tie them together into a vast collection of interactive multimedia resources.  WEBSITE A group of related Web pages tha...