A hand-held fan is an implement used to induce an airflow for the purpose of cooling or refreshing oneself. Any broad, flat surface waved back-and-forth will create a small airflow and therefore can be considered a rudimentary fan. But generally, purpose-made hand-held fans are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted to slats which revolve around a pivot so that it can be closed when not in use.
The movement of a hand-held fan provides cooling by increasing the airflow over the skin which in turn increases the evaporation rate of sweat droplets on the skin. This evaporation has a cooling effect due to the latent heat of evaporation of water.
Fans are convenient to carry around, and the folding kind in particular are compact to carry.
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