The theoretical limit of temperature is known as absolute zero, which is defined as 0 Kelvin (-273.15°C or -459.67°F). At this temperature, the motion of particles theoretically comes to a complete stop, representing the lowest possible energy state. According to the third law of thermodynamics, it is impossible to reach absolute zero in a finite number of steps. Understanding this concept is crucial for studying the behavior of matter at low temperatures, influencing fields like quantum mechanics and cryogenics.