The three different types of dictatorships are autocracy, absolute democracy and authoritarian oligarchy. A dictatorship is a political regime in which the government is not restricted by the law.
Autocracy is a political system in which one person occupying a single office has unchecked and overriding political power. In an autocracy, the government body has absolute power. The person in power is referred to as the autocrat and is usually a hereditary monarch. In an autocracy, the autocrat doesn't share power with a legislative body or other independent government centers.
Authoritarian oligarchy is also referred to as a "collective dictatorship." In this political regime, absolute power is given to a small group of people who make up a single and cohesive elite ruling class. This closely knit group operates as a single unit that wields absolute power. This elite group may gain power through inheritance, seizure of power or by election.
Absolute democracy is a form of government that is democratic, but not constitutional. This type of rule is characterized by the absolute power of the majority. Unchecked power resides with the majority of the adult citizens or their elected officials. In this system the laws that the majority or their representatives vote for becomes absolute law. No legal or constitutional restraints are established to limit the decision making power of the majority.