From the page: "The essential element of Zen Buddhism is found in its name, for Zen means "meditation." Zen teaches that enlightenment is achieved through the profound realization that one is already an enlightened being. This awakening can happen gradually or in a flash of insight (as emphasized by the Soto and Rinzai schools, respectively). But in either case, it is the result of one's own efforts. Deities and scriptures can offer only limited assistance.
Zen traces its origins to India, but it was formalized in China. Chan, as it is known in China, was transmitted to Japan and took root there in the thirteenth century. Chan was enthusiastically received in Japan, especially by the samurai class that wielded political power at this time, and it became the most prominent form of Buddhism between the fourteenth and sixteenth centuries. The immigrant Chinese prelates were educated men, who introduced not only religious practices but also Chinese literature, calligraphy, philosophy, and ink painting to their Japanese disciples, who often in turn traveled to China for further study."