Judicial interpretations affect existing laws by shaping their application and, at times, altering their meaning through legal precedents. Courts, particularly higher courts, may strike down or uphold laws based on constitutional interpretations, which determines the legality of government actions. For example, landmark cases can redefine the scope of civil rights or individual liberties, influencing legislative agendas and public policy. Moreover, judicial rulings can set precedents that guide lower courts in future cases, effectively modifying the legal landscape over time. Therefore, the judiciary plays a crucial role in ensuring laws align with constitutional values and principles.