Answer:
Decentralization: The transfer of control of an activity or organization to several local offices or authorities rather than one single one.
Federal System: When political authority is divided between two autonomous sets of governments, one national and the other subnational, both of which operate directly upon the people.
The difference between a unitary and a federal government is that a unitary government puts its power in one central government while in a federal system the governing power is divided into federal and local governing bodies that connect to the national government.