What technology does infrared technology primarily use for data transfer?

Infrared technology primarily uses infrared light waves for data transfer, which is the reason this option is the correct answer. Infrared waves have wavelengths longer than visible light but shorter than microwave signals. This range allows them to effectively transmit data over short distances without the interference that might be caused by other frequency bands.

Data transfer through infrared occurs in a line-of-sight manner, making it ideal for applications like remote controls and certain data communication protocols, especially in devices that do not require long-range communication.

The other options represent different types of electromagnetic waves used for various forms of communication and data transfer. Visible light waves are used in technologies like fiber optics but do not serve the same direct data transfer purpose as infrared. Microwave signals are typically utilized in satellite communications and radar, while radio waves are employed in long-distance communication methods like broadcasting and Wi-Fi. Thus, infrared light waves uniquely cater to data transfer within its specific technological applications.