Quantum clocks are highly precise timekeeping devices that utilize the principles of quantum mechanics to measure time. Unlike traditional clocks, which rely on mechanical or electronic oscillations, quantum clocks use the vibrations of atoms or ions. These atomic transitions occur at incredibly stable frequencies, allowing quantum clocks to achieve unprecedented accuracy. One of the most notable types of quantum clocks is the optical lattice clock, which traps atoms in a grid of laser light. This technology has the potential to improve global positioning systems and redefine the second, the standard unit of time, by providing a more stable reference than current atomic clocks.