Japanese public bath, or "sento," is a cultural institution that originated in the 6th century and provides relaxation, socialization, and health benefits. The design of a sento varies but typically includes at least two baths, locker rooms, changing areas, and restrooms. Visitors must follow specific etiquettes such as removing shoes before entering the changing room and washing themselves thoroughly before entering the bath. Sento faces challenges due to the rise of individual bathtubs and showers in Japanese homes and maintenance costs. However, if you plan to visit a sento, research beforehand, bring your own toiletries, and be respectful of others.