Definition
Hertz (Hz) measures frequency, like how many times something happens per second. Think of it as the speed of a vibration or wave, like sound or radio waves. A higher hertz means a faster vibration, resulting in a higher pitch in sound or a clearer signal in radio. It's used in electronics, music, and even medical devices. Imagine it as the "beats per minute" of a radio wave. It's essential for understanding how devices communicate and function. For example, your phone's refresh rate is measured in hertz.