Planck Time is the smallest measurable unit of time in the universe, defined as approximately 5.39 \times 10^-44 seconds. It is derived from fundamental constants, including the speed of light, Planck's constant, and Newton's gravitational constant. This tiny duration represents the time it takes for light to travel a distance equal to the Planck length. In the realm of physics, Planck Time is significant because it sets a limit on how we understand time and space at the quantum level. Below this scale, the conventional laws of physics may not apply, and the effects of quantum gravity become important, challenging our understanding of the universe.