Atomic clocks are highly precise timekeeping devices that use the vibrations of atoms to measure time. They typically rely on the frequency of microwave radiation emitted or absorbed by atoms, such as cesium or rubidium. This frequency is incredibly stable, allowing atomic clocks to maintain accuracy to within billionths of a second. These clocks are essential for various applications, including global positioning systems (GPS), telecommunications, and scientific research. The accuracy of atomic clocks helps synchronize time across the world, making them crucial for modern technology and navigation systems.