Suburbanisation
Suburbanisation or Suburbanization is when people move from the city center to the outskirts of the city, or the suburbs. Suburbanization is linked with urbanization, where people move from the countryside (called rural areas) to the cities. There is also a process called counterurbanization,  where a city loses its attractiveness, and people move back to the countryside. If suburbanisation happens in very large cities, this can lead to the establishment of new Satellite cities and  commuter towns. Functionally satelite cities and commuter towns are linked to the main city (as most people still work in the main city, and commute to work there).