What is government ruled by one person?

A government ruled by one person is known as a Dictatorship or autocracy. In this system, a single leader holds absolute power, often without the consent of the governed, and makes decisions unilaterally. Such regimes can suppress political opposition and limit individual freedoms, leading to a concentration of authority that can result in authoritarian rule. Examples include monarchy, where a king or queen may hold significant power, and totalitarian regimes led by a single leader.