Final answer:
An oligarchy is a form of government where power is held by a small, elite group. This group determines government decisions, often for their own benefit.
Step-by-step explanation:
An oligarchy is a form of government in which power is held by a small, elite group. This group may come to power through factors such as military strength or economic influence, rather than noble ancestry.
An oligarchy works by allowing a small number of individuals to have control and influence over government decisions. These individuals may use their power to benefit themselves and maintain their privileged positions. Only a select few have the opportunity to make changes, and the majority of citizens have limited influence over the decision-making process.