What's the difference between a mandate and a colony?
Mandate - Authority without ownership
Colony - Authority through ownership
Colonies are areas of land that fall under the control of a foreign power and are permanently owned by that power in every aspect
Mandated territories are areas of land that are administered policed and controlled by a foreign power where that control is authorised by an international or multinational body (ie the United Nations) usually for a distinct purpose or until certain things come to pass
For example after WW2 Britain was given a mandate to control and administer Palestine by the United Nations