1.There are two or more levels of government.
2.Different levels of government govern the same citizens.
3.Each levels has its own jurisdiction specific matter of legislation,taxation and administration.
4.The jurisdiction of the respective levels or tiers of government are specified in constitution .
5.Federalism written and rigid constitution and cannot change easily.
6. It is declared as the supreme law of land .

Seven Key Features of Federalism:
1. Division of Powers: Federalism involves the division of powers between the central government and the state governments. Each level of government has its own set of responsibilities and authority.
2. Constitutional Basis: Federalism is usually enshrined in the country's constitution, which outlines the powers and functions of each level of government. This ensures a clear framework for the distribution of powers.
3. Supremacy of Constitution: The constitution acts as the supreme law of the land in a federal system. All levels of government must abide by the constitution, which serves as the ultimate authority.
4. Independent Judiciary: In federalism, there is usually an independent judiciary that interprets the constitution and resolves disputes between the different levels of government. This helps maintain the balance of powers.
5. Dual Government: Federalism involves the existence of two levels of government - the central government and the state governments. This dual system allows for greater representation and diversity in governance.
6. Flexibility: Federal systems are often flexible and can accommodate diverse needs and interests of different regions within the country. States have the authority to make laws on certain matters that affect them directly.
7. Protection of States' Rights: Federalism helps protect the rights and interests of individual states within the country. States have the autonomy to govern themselves on certain issues, while still being part of a unified nation.
Overall, federalism promotes a balance of power, decentralization of authority, and protection of individual rights and diversity within a country.