Dimwit: this asinine nonquestion has been asked a thousand times on here.
"Women's studies is an interdisciplinary academic field devoted to topics concerning women, feminism, gender, and politics. It often includes feminist theory, women's history (e.g. a history of women's suffrage) and social history, women's fiction, women's health, feminist art, feminist psychoanalysis and the feminist and gender studies-influenced practice of most of the humanities and social sciences."
If youre still confused then try Google.
What about "Men's Studies", which has been around since the 1970's: do they study the finer points of Circle Jerking? Sorry if its exotic... I really dont know anything about it.