Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is an international time scale that defines the time interval between successive atomic transitions, serving as the global reference for timekeeping. Unlike systems based solely on the Earth's rotational measurements, UTC is maintained by highly accurate atomic frequency standards. While time zones use UTC as a baseline, local time is typically calculated by adding or subtracting a defined offset from the universal time standard. The definition of UTC is critical for the synchronization of global technological systems, including telecommunications, satellite navigation, and computing networks, ensuring a uniform measurement of elapsed time across varied geographical locations.