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 circle segment 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.

The folding fan was invented in Japan in the 8th century and taken to China in the 9th century. The Akomeogi (or Japanese folding fan; Hiôgi) originated in the 6th century. These were fans held by aristocrats of the Heian period when formally dressed. They were made by tying thin stripes of hinoki (or Japanese cypress) together with thread. The number of strips of wood differed according to the person's rank. They are used today by Shinto priests in formal costume and in the formal costume of the Japanese court (they can be seen used by the Emperor and Empress during coronation and marriage) and are brightly painted with long tassels. The Chinese dancing fan was developed in the 7th century. The Chinese form of the hand fan was a row of feathers mounted in the end of a handle.