Evaporation is considered an endothermic process. This means that during evaporation, the substance absorbs heat from its surroundings.
When a liquid evaporates, the molecules at the surface gain enough energy to break free from the attractive forces of the liquid and enter the gas phase. This energy is typically derived from the heat present in the environment (like the air or the surface of the liquid). As these molecules escape into the air, they take this energy with them, which ultimately leads to a reduction in the temperature of the remaining liquid and its surroundings.
For example, think about a puddle of water on a sunny day. The water molecules are gaining energy from the heat of the sun and the surrounding air as they evaporate. This is why you might notice that the surface of the puddle feels cooler over time — the process of evaporation is cooling down the water by absorbing heat energy.