The famous author and feminist who wrote "The Second Sex" is Simone de Beauvoir. Published in 1949, this significant work criticallyexamines the role of women in society and the concept of existentialism. De Beauvoir explores the ways women have been historically marginalized, ultimately arguing for their liberation and equality. Her impactful ideas have profoundly influenced feminist theory and continue to be relevant in discussions surrounding women's rights and societal roles. Her assertion that "one is not born but rather becomes a woman" remains a cornerstone of feminist philosophy today.