What are the differences between a monarchy a theocracy and an oligarchy?

A monarchy is a form of government where a single ruler, often a king or queen, holds significant power, usually inherited. A theocracy is governed by religious leaders or institutions, with laws and policies based on religious doctrine. In contrast, an oligarchy is ruled by a small group of individuals or families, often distinguished by wealth, education, or social status, who make decisions for the larger population. Each system differs fundamentally in its source of authority and the structure of power distribution.