IrDA infrared communication is an inexpensive and widely adopted short range wireless technology that allows devices to “speak” easily to each other. Key protocol features make operation simple even for inexperienced users or devices with very little user interface. Digital cameras, phones, pagers, data collectors, set-top boxes, modems, kiosks, instruments, machinery, ID badges, watches, and computer peripherals are some of the natural users of this technology. This paper introduces IrDA infrared data communications and explores both mandatory and optional IrDA protocol layers and strategies.