Jacques Derrida was a French philosopher who introduced the theory of deconstruction in 1967. Deconstruction is a critical reading of a text to uncover assumptions and contradictions. It questions the relationship between language and meaning by analyzing binary oppositions in language. Derrida was influenced by thinkers like Nietzsche, Freud, and Heidegger. Deconstruction aims to expose power dynamics and how language constructs reality rather than reflects a stable truth. It has been applied to literature, philosophy and other cultural texts.