Absolute Zero Temperature has been set down as 0 Kelvin (that is, -459.67 Fahrenheit, -273.15 Celsius, or 0 Rankine).
Absolute Zero is the theoretic temperature at which all molecular motion (oscillation, vibration, or "jiggling") in a pure crystal completely stops, which puts entropy or "disorder" of molecules at zero.
An extreme laboratory method has driven temperature down to 38 trillionths of 1 Kelvin (or 0.000000000038 Kelvin). This is said to be the closest temperature to Absolute Zero ever obtained.
Several sources say that Absolute Zero can never be actually reached because the Second Law Of Thermodynamics demands that 0 Kelvin be above a low temperature reservoir that is even "colder" than Absolute Zero from which the temperature could then rise to Absolute Zero (which is not possible).
A statement of the Third Law Of Thermodynamics has been given as "The entropy of a pure crystalline substance at Absolute Zero is 0" (since the state of the molecules at that temperature is certain).
