One popular moral theory that denies that morality is solely about the consequences of our actions is known as Deontology. The most influential and widely adhered to version of Deontology was extensively laid out by Immanuel Kant (1724–1804). Kant’s ethics, as well as the overall philosophical system in which it is embedded, is vast and incredibly difficult. However, one relatively simple concept lies at the center of his ethical system: The Categorical Imperative.
via Introduction to Deontology: Kantian Ethics (1000-Word Philosophy)