This chapter discusses ethics, morality, and theories of ethics. It defines ethics as the study of principles of right and wrong conduct, while morality refers to standards that distinguish acceptable vs unacceptable behavior. There are three main types of normative ethical theories - virtue ethics, which focuses on good character; deontological ethics, which focuses on duties and rules; and teleological ethics, which focuses on outcomes and consequences. Meta ethics studies the meaning and justification of ethical terms and judgments. Professional ethics refers to the moral issues that arise in professional fields due to specialized knowledge and responsibilities.