The first part is an electric field. The second part is a magnetic field. So that is why they are called electromagnetic waves. The two fields are at right angles to each other. Different parts of the radio spectrum have been allocated to the various services.
Radio waves have a much longer wavelength that light waves.
The longest waves are several kilometers in length. The shortest ones are only millimeters long. My HF radio transceiver can operate on all the HF amateur bands, but 20m and 80m are my favorites at present. On the 80m band the transceiver produces rf between 3.5MHz and 3.9MHz, the part of the transceiver which does this is called an oscillator. This means that the receiver removes the rf to leave the af.