Radio Frequency (RF) refers to the range of electromagnetic frequencies that lie in the range of around 3 kHz to 300 GHz, which are capable of carrying radio signals. These frequencies are used for various purposes such as communication, broadcasting and radar systems. In wireless communication devices like mobile phones or Wi-Fi routers, RF signals are transmitted at specific frequency bands that allow the device to communicate with other nearby devices without any physical connection. The term "radio frequency" is often associated with radio waves which can be generated by electronic devices such as transmitters and receivers in communication systems.