It is a type of govt in which power is divided into central authority and various constitutant units
The sharing of power among the central govt. ,state,regional and local govt. is known as federalism

Federalism means division of power. For example -legislature , judiciary and executive

A system in which the government power divided into several authority.For example Central government and state governments
It is a system of government in which the power is divided between a central authority & various constituent units of the country.
Federalism is a system of government which is entities such as states of government or Provences share power with National government.