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  Computer Hardware:                                                          Hardware are the physical components that make up a computer system. They include all electrical and mechanical devices attached to the computer for the purpose of input , process , storage and output operations . Generally all hardware components are classified as follows. a.        Input devices b.       Output devices c.        CPU d.       Memory a.      Input devices                                                     Input devices are the external hardware components that are used to enter or accept data and instructions into computer memory for processing. Examples are: Keyboard, Mouse, Track ball, Joy stick, Touch Screen, Light pen, Scanner. b.      Output devices                                                       Output devices are used to give results of processing to the user. Examples are: Monitors, Printers, Plotters and Speakers. Some types of hardware can act as bot

Mobile Computers:                                                                     Mobile Computing is a technology that allows processing and transmission of data, voice and video via a computer or any other wireless enabled device without having to be connected to a fixed physical link. Mobile Computers are devices which are used for computing. These devices include portable Laptops, Smartphones, Tablet P'cs and personal digital Assistants.