Critical theory is an approach to social philosophy that focuses on reflective assessment and critique of society and culture in order to reveal and challenge power structures. Critical Theory has a narrow and a broad meaning in philosophy and in the history of the social sciences. “Critical Theory” in the narrow sense designates several generations of German philosophers and social theorists in the Western European Marxist tradition known as the Frankfurt School. According to these theorists, a “critical” theory may be distinguished from a “traditional” theory according to a specific practical purpose: a theory is critical to the extent that it seeks human “emancipation from slavery”, acts as a “liberating … influence”, and works “to create a world which satisfies the needs and powers of” human beings (Horkheimer 1972b [1992, 246]). Because such theories aim to explain and transform all the circumstances that enslave human beings, many “critical theories” in the broader sense have been developed. They have emerged in connection with the many social movements that identify varied dimensions of the domination of human beings in modern societies. In both the broad and the narrow senses, however, a critical theory provides the descriptive and normative bases for social inquiry aimed at decreasing domination and increasing freedom in all their forms.