Absolute zero, defined as the lowest possible temperature, is valued at -273.15 degrees Celsius. At this temperature, molecular motion theoretically ceases, meaning that a system reaches its lowest energy state. Absolute zero serves as a reference point in the Kelvin scale, used in thermodynamics and various scientific fields. Achieving temperatures close to absolute zero has significant implications in quantum physics, allowing scientists to explore unique states of matter, including superconductivity and Bose-Einstein condensates. Understanding absolute zero also helps in the study of thermodynamic principles and the behavior of materials at low temperatures.