Meta-ethics is a branch of philosophy that explores the nature, origins, and meaning of ethical concepts. It seeks to understand what we mean when we use terms like "good," "bad," "right," and "wrong." Instead of focusing on specific moral issues, meta-ethics examines the foundations of our moral beliefs and the language we use to express them. This field addresses questions such as whether moral values are objective or subjective, and whether they exist independently of human opinions. Key topics in meta-ethics include moral realism, moral relativism, and non-cognitivism, which help clarify how we understand and justify our ethical judgments.