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Input/output (I/O), in computing, is a communication process between a computer and the outside world.
At its most basic level, an information system (IS), such as a software application, is installed on a computer and its users in the outside world operate the computer to get solutions to problems. Input refers to the signals or instructions sent to the computer. Output refers to the signals sent out from the computer.
This term is also known as I/O operations, which references the input and output actions.
There are input and output operations performed in a computer context everywhere. Simple common I/O devices include a mouse, keyboard, monitor and printer.
Following are the major contexts for the I/O term: