Answer:
Internal migration is the permanent displacement of certain groups of people within the same country, that is, from one region to another of the same nation. These displacements usually occur for economic reasons (that is, not for humanitarian issues, such as wars or major crises, since in those cases migration generally occurs abroad), such as work or personal relocations, such as life choices.
This type of migration tends to occur from rural areas to urban areas, and in general the labor force in cities increases, while that of rural areas decreases.