Military occupation, also known as belligerent occupation or simply occupation, is the effective military control by a ruling power over a territory that is outside of that power's sovereign territory. The territory is then known as the occupied territory and the ruling power the occupant. Occupation is distinguished from annexation and colonialism by its intended temporary duration. While an occupant may set up a formal military government in the occupied territory to facilitate its administration, it is not a necessary precondition for occupation.