An optical lattice clock is a highly precise timekeeping device that uses lasers to trap and cool atoms, typically strontium or ytterbium, in a grid-like structure known as an optical lattice. This setup allows the atoms to oscillate at a stable frequency, which is then used to measure time with exceptional accuracy. These clocks operate at optical frequencies, which are much higher than those used in traditional atomic clocks that rely on microwave frequencies. As a result, optical lattice clocks can achieve better stability and precision, making them valuable for applications in global positioning systems (GPS), fundamental physics, and timekeeping standards.