Zen is a Japanese school of Buddhism that emphasizes the practice of meditation and the attainment of enlightenment. It was founded in the 12th century by the monk Eisai, who brought the teachings of the Chinese ZEN master Dogen to Japan. ZEN is known for its focus on direct experience and insight into the nature of reality, as well as its emphasis on simplicity and self-discipline. It has become one of the most popular forms of Buddhism in the world today.