Internal migration or domestic migration is human migration within one geopolitical entity, usually a nation-state. Internal migration tends to be travel for education and for economic improvement or because of a natural disaster or civil disturbance. Cross-border migration often occurs for political or economic reasons. A general trend of movement from rural to urban areas, in a process described as urbanization, has also produced a form of internal migration. Internal migration or domestic migration is human migration within one geopolitical entity, usually a nation-state. Internal migration tends to be travel for education and for economic improvement or because of a natural disaster or civil disturbance. Cross-border migration often occurs for political or economic reasons. A general trend of movement from rural to urban areas, in a process described as urbanization, has also produced a form of internal migration.