Critical theory is a school of thought that stresses the reflective assessments and critique of society and culture by applying knowledge from the social sciences and the humanities. As a term, critical theory has two meanings with different origins and histories: the first originated in sociology and the second originated in literary criticism, whereby it is used and applied as an umbrella term that can describe a theory founded upon critique; thus, the theorist Max Horkheimer described a theory as critical insofar as it seeks "to liberate human beings from the circumstances that enslave them."
In sociology and political philosophy, the term critical theory describes the neo-Marxist philosophy of the Frankfurt School, which was developed in Germany in the 1930s. Frankfurt theorists drew on the critical methods of Karl Marx and Sigmund Freud. Critical theory maintains that ideology is the principal obstacle to human liberation. Critical theory was established as a school of thought primarily by five Frankfurt School theoreticians: Herbert Marcuse, Theodor Adorno, Max Horkheimer, Walter Benjamin, and Erich Fromm. Modern critical theory has additionally been influenced by György Lukács and Antonio Gramsci, as well as the second generation Frankfurt School scholars, notably Jürgen Habermas. In Habermas's work, critical theory transcended its theoretical roots in German idealism, and progressed closer to American pragmatism. Concern for social "base and superstructure" is one of the remaining Marxist philosophical concepts in much of the contemporary critical theory.
The Frankfurt School (German: Frankfurter Schule) is a school of social theory and philosophy associated in part with the Institute for Social Research at the Goethe University Frankfurt. Founded during the interwar period, the School consisted of dissidents who were at home neither in the existent capitalist, fascist, nor communist systems that had formed at the time. Many of these theorists believed that traditional theory could not adequately explain the turbulent and unexpected development of capitalist societies in the twentieth century. Critical of both capitalism and Soviet socialism, their writings pointed to the possibility of an alternative path to social development.
Although sometimes only loosely affiliated, Frankfurt School theorists spoke with a common paradigm in mind; they shared the same assumptions and were preoccupied with similar questions. To fill in the perceived omissions of classical Marxism, they sought to draw answers from other schools of thought, hence using the insights of antipositivist sociology, psychoanalysis, existential philosophy, and other disciplines. The school's main figures sought to learn from and synthesize the works of such varied thinkers as Kant, Hegel, Marx, Freud, Weber, and Lukács.