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Hz (Hertz) is the standard unit of frequency that measures the number of cycles or events occurring per second. Named after physicist Heinrich Hertz, it is used across various fields of science and technology. In electronics and telecommunications, Hz indicates the frequency of signals or waves—such as a radio frequency (e.g., 2.4 GHz for Wi-Fi) or a processor’s clock speed (e.g., 2.5 GHz CPU). In display technology, it measures screen refresh rate, such as 60Hz or 120Hz, which tells how many times per second the screen updates its image. Higher Hertz values generally mean faster or smoother performance in the relevant context.
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