A condom is a thin sheath that fits snugly over a man's erect penis during sexual contact. Its purpose is to prevent bodily fluids from passing between sexual partners, and thus prevent impregnation and/or transmission of sexually transmitted diseases (STDs).

Condoms come in different shapes, flavors, and sizes. There are also a variety of materials used for condoms, including latex, lambskin, polyurethane, and polyisoprene.