Computer networks are now common in educational institutions, offices and even in homes. Companies which have large number of computers prefer a network between these computers to access data from one another. By the effective resource sharing, management can reduce the manpower as well as time. This also reduces the peripherals such as printer. Thus in an office a high volume networked printer can perform the work of many individual printers. This reduces cost as well as maintenance complexity. Servers are used in big offices which can store enormous amount of data. Thus client-server model is used for large network-huge data systems. World Wide Web uses this model. Electronic mail or e-mail is used for communication. Videoconferencing is a latest tool by which employees at different locations can interact with each other just like in a meeting. For doing business including buy and sell, electronic commerce is used. Internet is a network now used by individuals sitting at home. Mobile phones and laptops opened the door for accessing internet while travelling too.
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