Condensation is an exothermic process. When a gas turns into a liquid, it releases energy in the form of heat. This happens because the molecules in the gas lose kinetic energy and move closer together, forming a liquid. The energy that was used to keep the molecules apart in the gas phase is released as heat during condensation.
For example, when water vapor in the air condenses into dew on a cold surface, the surface feels warmer because heat is being released. This release of heat is a key characteristic of exothermic processes.