Democracy originated in ancient Greece around the 7th century BC. It comes from the Greek words "demos" meaning people and "kratos" meaning rule, so democracy literally means rule by the people. Key principles of democracy include elections, political parties, and coalition governments. Rule of law is also important, establishing that all citizens are equal before the law. Decision making involves different branches of government - the legislature, executive, and judiciary. Promoting tolerance and human dignity are also central to democracy.