The definition of IrDA

The Infrared Data Association (IrDA) is a voluntary organization of various manufacturers working together to ensure that the infrared communications between different computers, PDAs, printers, digital cameras, remote controls, etc. are all compatible with each other regardless of brand. The term is also often used to designate an IrDA compliant infrared communications port on a device. Informally, a device able to communicate via IrDA compliant infrared is sometimes simply said to "have IrDA". There is also an earlier, incompatible, and usually slower type of infrared communications still in use called ASK.