Tatami is a traditional Japanese flooring material that is made of woven rush grass and is used in traditional Japanese homes and other buildings. Tatami mats are made by weaving soft rush grass around a core of rice straw. The result is a durable, yet cushioned surface that is ideal for sitting, sleeping, and walking on. Tatami is considered an important part of Japanese culture, and is often associated with simplicity, elegance, and natural beauty.