This document discusses radio waves and their properties. It describes that radio waves are electromagnetic waves that can propagate without a medium and have wavelengths between 1-1000 meters and frequencies between 104-107 Hertz. It is commonly used in telecommunications like phones, TV, and radio. The document also explains how radio waves are created through oscillating electric charges in a circuit, and classified based on frequency, wavelength, and modulation systems like AM and FM. AM has a longer range but is less clear while FM has a shorter range but is clearer.