<Li> I / O </Li> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> In computing, input / output or I / O (or, informally, io or IO) is the communication between an information processing system, such as a computer, and the outside world, possibly a human or another information processing system . Inputs are the signals or data received by the system and outputs are the signals or data sent from it . The term can also be used as part of an action; to "perform I / O" is to perform an input or output operation . </P>

Groups of i/o instructions used in computers