How is migration a determinant factor of population change?

Migration significantly influences population change by altering population size and demographic composition. Immigration adds to population growth, while emigration reduces it. It impacts age distribution, sex ratio, and ethnic diversity within a population. Migration often occurs due to economic opportunities, affecting population growth or decline. Additionally, it introduces new cultures and traditions to a region, shaping its cultural diversity. Overall, migration plays a crucial role in determining the size, structure, and cultural dynamics of a population.