Legal theories are frameworks that help explain how laws are created, interpreted, and applied. They provide a foundation for understanding the principles behind legal systems and guide judges, lawyers, and lawmakers in their decision-making processes. Common legal theories include natural law, which posits that laws are based on moral principles, and legal positivism, which argues that laws are rules created by human beings. These theories also influence various areas of law, such as contract law and criminal law. By examining the underlying philosophies, legal theories help clarify the purpose of laws and their impact on society, ensuring that justice is served effectively.