This document provides an overview of key concepts in feminism and gender theory, including: - Definitions of feminism and a brief history covering first, second, and third-wave feminism. - Summaries of the work and ideas of prominent theorists Angela McRobbie and Judith Butler. McRobbie studied youth culture and gender, while Butler argued that gender is a social construct and performance rather than a stable identity. - An introduction to queer theory and how it builds on Butler's work to question traditional definitions of sex, gender, and sexuality.