"Gender Trouble" is a groundbreaking book by Judith Butler that challenges traditional ideas about gender. Butler argues that gender is not a fixed identity but rather a performance shaped by societal norms and expectations. This means that our understanding of what it means to be male or female is constructed through repeated behaviors and cultural practices. The book introduces the concept of gender performativity, suggesting that individuals "perform" their gender roles rather than embodying an inherent identity. By highlighting the fluidity of gender, Butler encourages readers to question rigid classifications and embrace a more inclusive understanding of identity, paving the way for discussions on queer theory and feminism.