What is meant by the point of absolute zero?

The point of absolute zero refers to the theoretical temperature at which all molecular motion comes to a complete stop. This temperature is defined as 0 Kelvin, or -273.15 degrees Celsius (-459.67 degrees Fahrenheit). At this temperature, the entropy of a perfect crystalline substance reaches its minimum value, and particles possess the lowest possible energy state. This concept is grounded in the principles of thermodynamics and quantum mechanics.

When we consider the other options, the coldest natural temperature recorded, maximum density of substances, and the freezing point of water all describe different physical principles or conditions but do not correspond to the specific definition of absolute zero. Thus, the correct answer is directly linked to the cessation of matter's motion, highlighting the unique nature of temperature and energy at this fundamental limit.