Federalism contrasts sharply with unitary systems of government. Federalism is characterized by a clear division of powers between a central authority and regional governments, allowing each level of government to operate independently within its jurisdiction. Examples include the United States, India, and Brazil, where power is constitutionally guaranteed and each government level answers to its citizens. In contrast, unitary governments, such as Sri Lanka, consolidate authority in the central government, which can dictate terms to sub-national units. The advantages of federalism include accommodating regional diversity while promoting national unity, whereas unitary systems centralize power, often leading to uniform policies across diverse populations.