What is RF module and what products are it mainly used in?

Radio frequency module has many uses, and almost all electronic devices with radio frequency will use it. For example, the RF module of mobile phone, the RF module of GPS receiver for navigation, and the tuner of TV (also a form of RF module). The function of RF module is to convert radio signals into wired electrical signals, and vice versa. Why should we separate wired electrical signals from radio signals? Because of the particularity of radio signal, its signal is very weak, its interference is very severe, and it may be very severe, that is to say, it either interferes with others or is interfered by others, so in the circuit, we usually separate it from the general circuit in all aspects, such as power supply, ground wire, space and so on.