A villain (also known as the "antagonist", "baddie", "bad guy", "heavy" or "black hat") is an "evil" character in a story, whether a historical narrative or, especially, a work of fiction.
The villain usually is the antagonist (though can be the protagonist), the character who tends to have a negative effect on other characters. A female villain is occasionally called a villainess. Random House Unabridged Dictionary defines villain as "a cruelly malicious person who is involved in or devoted to wickedness or crime; scoundrel; or a character in a play, novel, or the like, who constitutes an important evil agency in the plot".
Villain comes from the Anglo-French and Old French vilain, which itself descends from the Late Latin word villanus, meaning "farmhand", in the sense of someone who is bound to the soil of a villa, which is to say, worked on the equivalent of a plantation in Late Antiquity, in Italy or Gaul. The same etymology produced villein. It referred to a person of less than knightly status and so came to mean a person who was not chivalrous. As a result of many unchivalrous acts, such as treachery or rape, being considered villainous in the modern sense of the word, it became used as a term of abuse and eventually took on its modern meaning. The Germanic word "churl", originally meaning "a non-servile peasant" and denoting the lowest rank of freemen in Saxon society, had gone through a similar degradation, as did the word "" which originally meant "farmer".
Vladimir Propp, in his analysis of Russian fairy tales, concluded that a fairy tale had only eight dramatis personae, of which one was the villain, and his analysis has been widely applied to non-Russian tales. The actions that fell into a villain's sphere were: