This document provides an overview of feminist theory. It begins with definitions of feminism and feminist theory, noting they aim to advance women's political, economic, personal and social rights. It then outlines the history of feminism from thinkers like Mary Wollstonecraft in the late 18th century. The document also details the three major waves of feminism - first wave focused on legal and political issues, second wave on civil rights and sexuality, and third wave emphasizes gender differences. Finally, it outlines some basic principles of feminism like increasing equality and expanding choice, and describes three major types - liberal, socialist, and radical feminism.