This document provides an introduction to imperialism, including its definition and different types. Imperialism is when a powerful nation dominates other countries politically, economically, or socially. There are four main types of imperialism discussed: colonies, protectorates, spheres of influence, and economic imperialism. The document then examines potential motives for why nations practice imperialism, such as exploratory, political, ideological, religious, and economic goals. Nations may seek to map new territories, control other governments, civilize foreign populations, convert people to their religion, or gain access to raw materials and trade.