The title *The Second Sex* is central to Simone de Beauvoir’s philosophical and feminist project and encapsulates the core argument of her work. By choosing this title, Beauvoir highlights the historically constructed status of women as secondary, subordinate, and “other” in relation to men. The title itself immediately suggests hierarchy and inequality, implying that humanity has been divided into two categories where one is considered primary and the other secondary. Beauvoir’s aim is to question and dismantle the cultural, social, philosophical, and historical foundations that have placed women in this secondary position. The phrase “Second Sex” reflects Beauvoir’s existentialist understanding of human identity. Existentialism, influenced by philosophers such as Jean-Paul Sartre, holds that existence precedes essence and that individuals are not born with fixed identities but create themselves through actions and choices. However, Beauvoir argues that women historically have been denied this freedom. Instead of being allowed to define themselves as autonomous subjects, they have been defined by men and confined to roles determined by patriarchal society. The title therefore signifies that women have been placed in the position of “the other,” while men have been regarded as the norm or the universal human being. A key concept underlying the title is Beauvoir’s famous statement: “One is not born, but rather becomes, a woman.” This idea emphasizes that the social identity of women is not determined purely by biological differences but is shaped by cultural expectations, education, tradition, and social institutions. The title *The Second Sex* captures the outcome of this social construction. Women are treated as the second category of humanity, whose identity is defined in relation to men. In this framework, man is considered the subject, the essential being, while woman is constructed as the object, the inessential or secondary being. The title also reflects Beauvoir’s analysis of historical and cultural traditions. Throughout history, philosophical, religious, and literary texts have often portrayed women as inferior or dependent beings. From Aristotle’s description of women as incomplete men to religious narratives that associate women with temptation and weakness, many intellectual traditions have reinforced the idea that women occupy a lower position in society. Beauvoir’s title summarizes this long-standing tradition of viewing women as the “second” or subordinate sex. Another significant aspect of the title lies in its challenge to biological determinism. Beauvoir carefully examines biological differences between men and women but argues that biology alone cannot justify