Jacques Derrida is widely regarded as one of the most influential figures in postmodernism and deconstruction. His work, particularly his concept of différance, challenged traditional notions of truth, meaning, and representation.

Différance, as introduced by Jacques Derrida, refers to the idea that meaning is not fixed or inherent but rather is created through differences and deferrals. It suggests that meaning is constantly shifting and unstable, and that it is produced through the relationships between words, concepts, and ideas.

Michel Foucault's work focused on the relationship between knowledge and power. He argued that knowledge is not neutral or objective but rather is shaped by and perpetuates power structures. His concept of discourse analysis aimed to uncover the ways in which knowledge is used to maintain and legitimize power.

Jean-François Lyotard's theory of postmodernism centers on the critique of grand narratives, or overarching metanarratives that claim to provide universal truths and explanations. He argued that these narratives have lost their legitimacy and that postmodernity is characterized by a plurality of local and contingent narratives.

Roland Barthes's concept of the 'death of the author' challenges the traditional notion of the author as the sole source of meaning in a text. He argued that the meaning of a text is not fixed by the author's intention but rather is produced through the interaction between the text and the reader.

Deconstruction, as a critical method, aims to dismantle the binary oppositions that shape our understanding of the world. It seeks to expose the limitations and contradictions of these oppositions and to challenge the assumptions and values that underlie them.

Richard Rorty's work focused on the social and historical contingency of truth. He argued that truth is not an objective or universal property but rather is a product of social practices and conventions. He also challenged the idea of a single, overarching reality, suggesting that there are multiple, contingent realities that are shaped by our beliefs and values.

The concept of the 'rhizome,' introduced by Gilles Deleuze and Félix Guattari, represents the interconnectedness and fluidity of knowledge and meaning. It challenges the idea of a linear, hierarchical organization of knowledge and suggests that knowledge is produced through multiple, interconnected pathways and networks.

Postmodernism challenges traditional notions of identity by emphasizing the diversity and fluidity of identity. It recognizes that identity is not fixed or essential but rather is constructed and performed through social interactions, cultural norms, and personal experiences.

Fredric Jameson's work explored the relationship between culture and capitalism. He argued that the distinction between high and low culture is artificial and arbitrary, and that both forms of culture are shaped by the economic and social conditions of their production.

Judith Butler's theory of gender performativity critiques essentialist notions of gender. She argues that gender is not a fixed or natural category but rather is performed and enacted through social practices and interactions. She emphasizes the fluidity and performative nature of gender identities.

Postmodernism challenges traditional notions of truth and objectivity by emphasizing the subjective and contingent nature of truth. It recognizes that truth is not absolute or universal but rather is shaped by individual perspectives, cultural contexts, and historical circumstances.

Fredric Jameson's work explored the cultural and social conditions of postmodernity. He argued that the postmodern condition is characterized by a sense of fragmentation, discontinuity, and loss of meaning. He attributed this condition to the dominance of consumer capitalism and the decline of traditional narratives and values.

Postmodernism in literary criticism encourages multiple and diverse interpretations of literary texts. It challenges the idea of a single, correct interpretation and recognizes that the meaning of a text is constructed through the interaction between the text and the reader. This approach allows for a richer and more nuanced understanding of literary works.

Metafiction in postmodern literature involves the exploration of the relationship between fiction and reality. It often involves self-reflexive elements, where the author or narrator acknowledges the fictional nature of the work and engages in a dialogue with the reader. Metafiction challenges traditional notions of realism and invites readers to question the boundaries between fiction and reality.