Method of transferring data using EMR (electromagnetic radiation) and without wires. A common example of a IR (infrared) device is a TV remote. However, infrared is also used with computers and devices like a cordless keyboard, cordless mouse, and infrared touch screen.
The picture shows the Nintendo Wii remote and another example of an infrared device.
Most computer wireless devices (e.g., wireless keyboard and mice) used with computers today are using Bluetooth and not infrared.