What technology is at the base of wireless data transmission between various devices over short distances?

Bluetooth

Bluetooth is named after a 10th-century Viking king, Harald "Bluetooth" Gormsson, known for uniting Denmark and Norway. Just as the king had united territories, Bluetooth technology aimed to unify communications between devices. Introduced in the mid-1990s, this technology now enables a wide range of devices, from headphones to cars, to connect without the constraints of cables. The idea of a simple and universal wireless connection was revolutionary at the time and has profoundly influenced how we use our electronic gadgets.