what makes a femme fatale?

A femme fatale is a seductive female protagonist within a film who aims to maintain the dominant role, but always fails. The recurring themes of these characters inculdes them smoking, wearing trousers- to enable a manly edge in their lifestyle and they often cover their faces with large sunglasses- this adds to the mysterious ways of the character and causes enigma within the film and almost satisfies women as they get represented dominantly for some time atleast, before they die. Seductiveness seems to be the triumph within the character however leaqding to the downfall.