The primary wireless technology used in smart home devices is Wi-Fi. Wi-Fi allows devices to connect to the internet and communicate with each other wirelessly. Many smart home gadgets, such as lights, thermostats, and security cameras, use Wi-Fi to enable remote control and automation through smartphone apps. Other wireless technologies like Zigbee and Z-Wave are also common, but Wi-Fi is the most prevalent due to its high data transfer rates and widespread availability.