Feminist theory developed out of the feminist movement to achieve social, political, and economic equality between men and women. There are several branches of feminist theory, including liberal feminism which focuses on achieving equal rights and opportunities, Marxist feminism which views women's oppression as stemming from their roles in the family and economy under capitalism, and radical feminism which argues that patriarchy and male domination are the primary forms of oppression. Feminist theorists have developed new perspectives and methodologies to incorporate women's experiences and challenge the male bias in traditional sociological theories.