Frequency is a fundamental physical quantity representing the number of cycles or oscillations occurring per unit of time, typically measured in Hertz. This concept is essential for describing oscillating systems, particularly those involving electromagnetic radiation. Such waves propagate through space via oscillating electric and magnetic fields, with frequency determining the rate at which these fields cycle. Varying the frequency alters the energy profile of the waves, allowing for the differentiation between various forms of energy, including radio waves, visible light, and higher-energy spectra like X-rays. Understanding frequency is crucial in fields ranging from communication technology to medical imaging.