The main function of the judiciary in a political system is to interpret and apply the law. It ensures that laws and policies comply with the Constitution and upholds justice by adjudicating disputes between individuals, organizations, and government entities. The judiciary acts as a check on the powers of the executive and legislative branches, maintaining the rule of law and protecting individual rights. In democracies, an independent judiciary is crucial for maintaining public confidence in the legal system and ensuring impartiality in the application of laws.