The radio frequencies are classified according to their wavelength:

Very long waves: <30 kHz ( >10'000 m)

Longwaves: 30 kHz - 300 kHz (10'000 - 1000 m)

Mediumwaves: 300 kHz - 3000 kHz ( 1000 - 100 m)

Shortwaves: 3000 kHz - 30 MHz ( 100 - 10 m)

VHF: 30 MHz - 300 MHz ( 10 - 1 m)

UHF: 300 MHz - 3000 MHz ( 1 - 0.1 m)

Radiowaves are used for broadcast, mobile, maritime and aeronautical communication, amateur radio, time signals, TV and by the military.