A unit hertz (Hz) represents the frequency of a periodic event, where one hertz corresponds to one cycle per second. It's a fundamental unit in physics and engineering, commonly used to measure the frequency of vibrations, oscillations, and waves across various domains such as sound, electromagnetic radiation, and electrical signals. Whether analyzing the pitch of sound waves, characterizing the frequency of radio waves, or specifying the refresh rate of electronic displays, the hertz provides a standardized and universally accepted unit for quantifying the rate of repetitive events.