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, social structures, and power dynamics shape knowledge and meaning. Derrida in particular showed how meaning depends on difference and there is no single truth. Postmodernism built on post-structuralism by further critiquing grand narratives and embracing multiple perspectives.