Spray tan is a cosmetic treatment that provides a temporary tan to the skin without sun exposure. It involves applying a fine mist of tanning solution, which contains a color additive called dihydroxyacetone (DHA). This solution reacts with the outer layer of the skin, resulting in a bronzed appearance that typically lasts about five to seven days. The process can be done at a salon or with at-home kits. Spray tanning is popular for its quick results and the ability to achieve an even tan without the risks associated with UV radiation from the sun or tanning beds.