I / O (short for input / output) is a general term for devices that send computers informartion from the outside world and that return the results of calculations. For personal computers, for example, Keyboard and mouse are the main ways people directly enter information into the computer; and the screen is the main way in which information from the computer is presented back to the user, though printers, speakers and headphones are common, too. there is a huge variety of other devices for obtaining input types. an example is a digital camera, which can be used to input visual information. the ability to transfer data between computers has opened up a vast range of possibilities for the computer. global Internet allows millions of computers to transfer information of all types among each other
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