Definition

input/output (I/O)

I/O (input/output), pronounced "eye-oh," describes any operation, program, or device that transfers data to or from a computer. Typical I/O devices are printers, hard disks, keyboards, and mouses. In fact, some devices are basically input-only devices (keyboards and mouses); others are primarily output-only devices (printers); and others provide both input and output of data (hard disks, diskettes, writable CD-ROMs).

Related glossary terms: Ohm's Law, reboot (warm boot, cold boot), self-destructing email, shared memory, electron, L1 and L2, permittivity (electric permittivity), cardinality, angular velocity (rotational velocity), SKU (stockkeeping unit)

This was last updated in October 2008

Posted by: Margaret Rouse

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