Liberal democracy or western democracy is the combination of a liberal political philosophy that operates under a representative democratic form of government. It is characterized by elections between multiple distinct political parties, a separation of powers into different branches of government, the rule of law in everyday life as part of an open society, a market economy with private property, universal suffrage, and the equal protection of human rights, civil rights, civil liberties and political freedoms for all people. To define the system in practice, liberal democracies often draw upon a constitution, either codified or uncodified, to delineate the powers of government and enshrine the social contract. The purpose of a constitution is often seen as a limit on the authority of the government. A liberal democracy may take various and mixed constitutional forms: it may be a constitutional monarchy (Australia, Belgium, Canada, Japan, Norway, Spain and the United Kingdom) or a republic (France, India, Ireland, the United States). It may have a parliamentary system (Australia, Canada, India, Ireland, the United Kingdom), a presidential system (Indonesia, the United States), or a semi-presidential system (France). Liberal democracies are contrasted with illiberal democracies and with dictatorships.
Liberal democracy traces its origins—and its name—to the Age of Enlightenment. The conventional views supporting monarchies and aristocracies were challenged at first by a relatively small group of Enlightenment intellectuals, who believed that human affairs should be guided by reason and principles of liberty and equality. They argued that all people are created equal and therefore political authority cannot be justified on the basis of noble blood, a supposed privileged connection to God or any other characteristic that is alleged to make one person superior to others. They further argued that governments exist to serve the people—not vice versa—and that laws should apply to those who govern as well as to the governed (a concept known as rule of law).