What is a computer? Computer is an electronic devices, operating under the control of instructons stored in its own memory, that can accept data, process the data according to specified rules, produces results, and stores the results for future use. The electric, electronic, and mechanical components of a computer, or hardware, include input devices, output devices, a system unit, storage devices and communication devices. An input device allows you to enter data or instructions into a computer. An output device conveys information to one or more peoples. The system unit is a case that contains the electronic components of a computer that are used to process data. A storage devices records and/or retrieves items to and from storage media. A communication devices enables a computer to send and receive data, instuctions, and information to and from one or more computers.
In computing, an input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or other information appliance. Input and output devices make up the hardware interface between a computer and a scanner or 6DOF controller. Keyboards
A 'keyboard' is a human interface device which is represented as a layout of buttons. Each button, or key, can be used to either input a linguistic character to a computer, or to call upon a particular function of the computer. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards Pointing devices
A pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touch screens, this is usually achieved by detecting movement across a physical surface. Analog devices, such as 3D mice, joysticks, or pointing sticks, function by reporting their angle of deflection. Movements of the pointing device are echoed on the screen by movements of the pointer, creating a simple, intuitive way to navigate a computer's GUI. High-degree of freedom input devices
Some devices allow many continuous degrees of freedom as input. These can be used as pointing devices, but are generally used in ways that don't involve pointing to a location in space, such as the control of a camera angle while in 3D applications. These kinds of devices are typically used in CAVEs, where input that registers 6DOF is required. Composit devices
Technically mice are composite devices, as they both track movement and provide buttons for clicking, but composite devices are generally considered to have more than two different forms of input. For the example: Game controller, gamepad and Wii remote. Imaging and Video input devices
Video input devices are used to digitize images or video from the outside world into the computer. The information can be stored in a multitude of formats depending on the user's requirement. For the examples: Digital camera, Webcam and image scanner.
Output devices are things we use to get information OUT of a computer An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human-readable form.
A display device is an output device that visually conveys text, graphics, and video information. Information shown on a display device is called soft copy because the information exists electronically and is displayed for a temporary period of time. Display devices include CRT monitors, LCD monitors and displays, gas plasma monitors, and televisions. Computer monitor
Types of output
Some types of output are text, graphics, tactile, audio, and video. Text consists of characters (letters, numbers, punctuation marks, or any...