"Landmark decisions" refer to significant rulings made by courts that have a profound impact on the law and society. These decisions often set important legal precedents, influencing future cases and shaping public policy. They can address critical issues such as civil rights, individual freedoms, and governmental powers. One of the most famous landmark decisions in the United States is Brown v. Board of Education, which declared racial segregation in public schools unconstitutional. Another notable case is Roe v. Wade, which recognized a woman's right to choose an abortion. Such decisions often spark widespread discussion and can lead to changes in legislation and societal norms.