The Supreme Court plays a vital role in interpreting the Constitution and determining the constitutionality of laws. It reviews cases that challenge the legality of legislative acts, examining whether these laws align with constitutional principles and protections. Through judicial review, the Court can strike down laws that violate constitutional rights, influencing social issues like freedom of speech and equal protection. This power ensures that no law transcends the constitutional framework, maintaining a system of checks and balances that protects civil liberties, thereby reinforcing the rule of law in democracies.