What is Bluetooth and what frequency does it operate on?

Bluetooth is a short-range wireless technology standard for exchanging data over short distances using UHF radio waves in the 2.4 GHz ISM band (2.400-2.4835 GHz). It uses frequency hopping spread spectrum (FHSS), hopping between 79 channels at 1 MHz spacing to minimize interference. Bluetooth is designed for low power consumption and supports data rates from 1 Mbps (Classic) to 2 Mbps (Bluetooth 5.0). It's commonly used for headphones, keyboards, mice, and IoT devices with a typical range of 10-100 meters depending on the class.