The document discusses different types of migration including international migration between countries, and internal migration within a country between states, districts, and intrastate. International migration examples given are Keralites migrating to Gulf countries. Internal migration examples given are Bengalis moving to other Indian states. Causes of migration include better employment opportunities, high standards of living, poverty, natural disasters, and wars. Factors affecting migration include pull factors that attract people to an area like higher employment and services, and push factors that cause people to leave an area like drought, high crime, and lack of services.