The main function of a constitution in a political system is to establish the foundational principles and frameworks that govern a nation. It outlines the structure of government, delineates the separation of powers, and guarantees the rights of citizens. A constitution serves as a legal document that provides stability and coherence to a political system, detailing how laws are made, enforced, and interpreted. It also serves as a social contract, embodying the collective aspirations and values of the society. By doing so, constitutions help maintain order and protect the rights of individuals against government overreach.