Kohlberg's Stages of Moral Development is a theory proposed by psychologist Lawrence Kohlberg that outlines how individuals develop moral reasoning over time. The theory is divided into three main levels: pre-conventional, conventional, and post-conventional, each containing two stages. In the pre-conventional level, moral reasoning is based on self-interest and avoiding punishment. The conventional level focuses on societal norms and the importance of maintaining relationships, while the post-conventional level emphasizes abstract principles and individual rights. Each stage represents a different way of thinking about morality. For example, in the first stage, individuals obey rules to avoid punishment, while in the second stage, they act in their own interest. As people progress through the stages, their understanding of morality becomes more complex, considering broader ethical principles and the welfare of others.