This document provides background information on emotivism and discusses the key philosophers and ideas associated with this view. Emotivism is an ethical theory that claims moral judgments are non-cognitive expressions of attitude or preference. It is considered a noncognitivist view. The theory is also known as the "hurrah-boo" theory because moral judgments are seen as expressions of approval or disapproval rather than statements of fact. The document examines the views of philosophers like A.J. Ayer and C.L. Stevenson who were influential in developing emotivism and considers some common criticisms of the view.