How are federal governments different from unitary governments?

So in unitary government, the central government has all the power.

In a federal system, some of the powers in a federal system are given to the central government and other powers are given to the lower levels of government.

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explanation:

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings