Moral psychology is the study of why people believe certain things are right or wrong. It's a field of psychology that explores why people have certain ideas of what is moral and what is immoral, and how these beliefs can shape behavior and decision-making. Moral psychologists might look at why people believe that stealing is wrong, or why they think murder is wrong. By looking at people's beliefs on what is right and wrong, researchers in this field can learn more about how people think and make decisions.