Radio waves are the radiation and detection of a range of frequency of electromagnetic waves. Frequency is the number of wavelengths that pass a particular point in one second and for radio waves the frequency is from 3 kHz to 300 GHz. Radio waves like all electromagnetic waves are able to carry information through space. Radio waves can travel unimpeded through objects like buildings or people but light waves can not. This is because radio waves have a very long wavelength allowing them to pass through objects that have shorter wavelengths like you and me without problem.
During the second half of the 18th century, Ben Franklin was the one who began the scientific study of lightning. He designed an experiment which conclusively proved the electrical nature of lightning. The experiment revealed that clouds are electrically charged so began his journey into lightning. Learn more here.