Have you seen the symbol of a circle with black and white swirls? That is the Taijitu (太极图 - tàijítú), representing Yin and Yang (阴阳 - Yīn Yáng). This ancient Chinese philosophy says that opposite forces are interconnected and need to be in balance. Yin is dark, feminine, and passive (like the moon). Yang is light, masculine, and active (like the sun). They are not good or bad; they need each other. This idea influences Chinese medicine, food, martial arts, and even how people try to live their lives—seeking harmony and balance.