The unit of measurement for the frequency of waves is the hertz (Hz). One hertz is defined as one cycle per second, representing how often a wave oscillates in a given time frame. The concept of frequency is vital in the study of waves, including sound waves, light waves, and electromagnetic waves. Understanding frequency is important as it affects the characteristics of the wave, such as its wavelength and energy. The hertz is widely used in physics, engineering, telecommunications, and audio technology.