This study addresses the basic question, "What is feminism?" by outlining the various strands of feminist theory: liberal, cultural, Marxist-socialist, Freudian, and radical. This fourth edition brings the discussion up-to-date, integrating the developments in feminist theory that have emerged in the last two decades, such as ecofeminism, multiculturalism, postmodernism, and global feminism - including new material since the publication of the third edition (2000).