An example of an exothermic process is the phase change from gas to liquid, known as condensation. When a gas, such as water vapor, cools down, it loses energy and transitions into a liquid state. This energy release into the surrounding environment warms the air around it, which is why condensation is classified as exothermic.
To put it simply, during condensation, the molecules in the gas phase slow down as they lose energy, allowing them to come together to form liquid. The release of heat during this process is what makes it exothermic. Common examples of condensation can be seen when dew forms on grass in the early morning or when water droplets appear on the outside of a cold drink.