The Second Law of Thermodynamics states that in any energy transfer or transformation, the total entropy of a closed system will always increase over time. Entropy is a measure of disorder or randomness, meaning that natural processes tend to move towards a state of greater disorder. For example, when you mix hot and cold water, the heat spreads out, leading to a more uniform temperature, which represents an increase in entropy. This law explains why certain processes are irreversible. For instance, when you drop an ice cube in a warm drink, the ice melts, and the drink cools down. The energy spreads out, and the system becomes more disordered, illustrating how energy transformations favor increased entropy in the universe.