In a broad sense, Zen is a school of mystical contemplation or the doctrine of the enlightenment, emerged on the basis of Buddhist mysticism. In the narrower sense, Zen is sometimes seen as one of the most influential schools of Buddhism in Japan, with its national identity, and came from China in the late twelfth century. In addition, under the understand Zen practice Zen schools, as denoted by the concept "Dhyana" is the most important part of Buddhist practice.