Definitions

• in-migration: Migration to a place (especially migration to a certain country where you are not native to)
• out-migration: Migration from a place (especially migration from your native country)
• forced migration: Forced or compelled to move to a country in which you are not a native, or from a country in which you are a native. 
• net internal migration: Crossing into a country or state and staying there for a long time.
• movers from abroad: Moves from overseas. 
• internally displaced person (IDP): Forced to flee there home, but is in there country's border.