Colonialism is a practice or policy in which a country extends its control over foreign territories, often by establishing settlements or exploiting resources. This typically involves the domination of one nation over another, resulting in the subjugation of the local population, disruption of their culture, and imposition of foreign governance and economic systems. Colonialism can also refer to the broader historical period characterized by such practices, during which many regions of the world experienced colonization by European powers and others.