Input and output....

Input is a data or instructions entered into the memory of computer. Input devices is any hardware component that allows users to enter data and instructions. The examples of input is mouse, touch screen, keyboard, digital pen, biometric input, graphics tablet, game controller, joystick and many more. Keyboardd is one of the input. Keyboard is a input device that contains key users press to enter data into a computer. Mouse is a pointing devices that fits pointer under the palm of your hand and its pointer devices controls movement of pointer. There is optical mouse which is its actually sense light to detect mouse's movement. The trackball is a stationary pointing device with a ball on its top or side.
Touchpad is one of the input. Touchpad is a pointing stick that pointing device shaped like pencil eraser positioned between keys on keyboard. Light pen is handheld input device that can detect the presence of light. Touch screen is a touch areas of screen with finger and it often used with kiosks. Digital pen looks like a ballpoint pen, but uses pressure to write text and draw lines and it used with graphics tablets, flat electronic boards.
Games controllers also one of the input. There's a lot type of game controllers such as gamepad, joystick, wheel, light gun, dance pad and motion-sensing game controller. Touch-sensitive pad is input device on aportable media player that enables users to scroll through and play music, view pictures, watch videos or movies, adjust volume and customize settings.
There is other types of input and there is voice input which is entering input by speaking into a microphone and its voice recognition or speech recognition is the computer's capibility to distinguish spoken words. Audio input is also one of the input. Its entering sounds into a computer-speech, music, and sound effects.
Output is a data that has been processed into a useful form. Output device is any harsware component that can convey information to one or more people. display device is one of the output. output device that visually conveys text, graphics and video information. LCD monitor uses liquid crystal display. Plasma monitor is also one of the output. Plasma monitor uses gas plasma technology. There is also CRT monitor which is contains cathode-ray tube (CRT). printers is also one of the output. Printer is output device that produces text and graphics on a physical medium.