A femme fatale is a stock character of a mysterious and seductive woman whose charms ensnare her lovers, often leading them into compromising, dangerous, and deadly situations. She is an archetype of literature and art. Her ability to entrance and hypnotise her victim with a spell was in the earliest stories seen as being literally supernatural; hence, the femme fatale today is still often described as having a power akin to an enchantress, seductress, vampire, witch, or demon, having power over men. In American early 20th century film, femme fatale characters were referred to as vamps, an allusion to their role as sexual vampires. (source)