What is the basis of classification of governments as unitary and federal?

What is the basis of classification of governments as unitary and federal? Correct Answer Relationship between the centre and states

On the basis of distribution of powers between the centre and states, the government is classified into two Unitary and Federal government. In Unitary form of govt all powers are kept with center, some of which can be delegated to state whereas in federal government there is complete division of powers between center and state.

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