Ethics is a branch of philosophy which has a central concern of deciding of how people should lead their lives in accordance of differentiating the right actions from wrong actions. Ethical theory is a set of principles of right conduct. Ethics basically distinguishes between right deed and wrong deed. In this paper, I will discuss about the general subject areas of ethical theories. It will include information about morality and how each ethical theory presents ethics and how we can apply them in reality. It will also discuss a case and how I would apply my preferred ethical theory to solve it. Finally, it will state which ethical theory is most reasonable to me and why.