Post-structuralism emerged in the late 1960s as a theoretical approach that questioned structuralism. It was influenced by French theorists including Jacques Derrida, Michel Foucault, Jacques Lacan, Julia Kristeva, and Roland Barthes. These theorists revealed how language, concepts, and social structures depend on elements they seek to exclude. Derrida in particular showed how meaning is unstable and dependent on difference rather than a direct link between signifier and signified. Postmodernism built on post-structuralism by further questioning truth claims and grand narratives. Theorists examined how power shapes knowledge and marginalizes groups.