Feminism seeks equal rights for women. It began as a movement in the 19th century for women's suffrage and rights to education and work. The history includes four waves - first wave feminism in the 19th century focused on suffrage, second wave feminism from the 1960s focused on inequality, third wave feminism from the 1990s challenged prior definitions of femininity, and a potential fourth wave could address current issues. Anti-feminism opposes feminism and its ideas about patriarchy and women's disadvantages in society.