Women's sports, both amateur and professional, have existed throughout the world for centuries in all varieties of sports. Female participation and popularity in sports increased dramatically in the 20th century, especially in the last quarter-century, reflecting changes in modern societies that emphasize gender parity. The number of women who currently play sport or who closely follow sport events is stealy increasing. Although the level of participation and performance still varies greatly by country and by sport, women's sports are generally accepted throughout the world today.