1. A Constitution lays out the fundamental ideals and principles that citizens of a country agree should form the basis of how their society is governed.
2. It defines the nature of a country's political system, such as whether it will be a democracy, monarchy, etc.
3. A Constitution establishes rules and procedures for how the government will function and exercise power, as well as protections for citizens' rights, to prevent abuse of power and ensure a functioning democratic system.