Input/output. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it. There are many input and output devices such as multifunction printers and computer-based navigation systems that are used for specialized or unique applications. In computing, input/output refers to the communication between an information processing system and the outside world. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it together. Types of output. Some types of output are text, graphics, tactile, audio, and video.