Solidification is the process where a substance changes from a liquid to a solid state. This occurs when the temperature of the liquid drops below its freezing point, causing the molecules to slow down and arrange themselves into a fixed structure. For example, when water freezes, it transforms into ice, which is a solid form of water. During solidification, energy is released as the liquid cools, which is why you might feel cold air when ice forms in a freezer. This process is essential in various applications, such as making ice cubes for drinks or creating metal parts through casting in manufacturing.