See title for the question.

I want this thread to be completely open to your mind. Hence the simple OP.

What is a villain? What makes a villain? What motivation drives him/her/it? How does one become a villain?
Also: How'd you learn what a villain is? Or at least what is a villain supposed to be? Y'know. All that random stuff.

I talk in a very generic sense. Real life, nowadays, far away past or far away future, fantasy universe, it does not matter.

I expect lots of interesting thoughts.