Deposition is an exothermic process. It involves the change of a substance from a gas directly to a solid without passing through the liquid phase. During this process, energy is released in the form of heat. This is because the gas molecules lose energy as they transition to a more ordered solid state.
For example, when water vapor in the air turns directly into frost on a cold surface, it releases heat into the surroundings. This heat release is a characteristic of exothermic processes.