Why does sitting under a fan on a hot day makes us feel cool during summer?

Sitting under a fan on a hot day makes us feel cool because the fan increases the rate of evaporation of sweat from our skin. As sweat evaporates, it takes heat away from our body, which helps to lower our body temperature. Additionally, the moving air from the fan enhances the convective heat loss, making us feel cooler than the actual air temperature. This combination of evaporative cooling and increased airflow creates a refreshing effect on hot days.