Federalism:
Federalism is a system of government in which power is divided between a central authority and constituent political units. Key features of federalism include:
- Division of powers: The powers of government are divided between the national government and the state governments.
- Autonomy: Each level of government has some degree of autonomy in its own sphere of authority.
- Dual sovereignty: Both the national government and the state governments have their own powers and responsibilities.

Separation of powers:
Separation of powers is the principle that the powers of government should be divided between separate branches to prevent one branch from becoming too powerful. Key features include:
- Three branches: Executive, legislative, and judicial branches are separate and have their own powers and responsibilities.
- Checks and balances: Each branch has some control over the other branches, ensuring that no branch becomes too powerful.

Fundamental rights:
Fundamental rights are basic rights and freedoms that are guaranteed to individuals by the Constitution. Key features include:
- Protection of liberties: Fundamental rights protect individual liberties such as freedom of speech, religion, and assembly.
- Equality: Fundamental rights ensure that all individuals are treated equally under the law.

Secularism:
Secularism is the principle of separating government institutions and officials from religious institutions and religious beliefs. Key features include:
- Religious neutrality: The government does not favor any religion over others or promote religious beliefs.
- Freedom of religion: Individuals have the right to practice any religion or no religion without interference from the government.

Parliamentary form of Government:
In a parliamentary form of government, the executive branch derives its legitimacy from and is accountable to the legislature. Key features include:
- Fusion of powers: The executive branch is drawn from and accountable to the legislature.
- Collective responsibility: The cabinet is collectively responsible to the parliament for its actions.