Chán (Mandarin) is a Chinese tradition of Mahāyāna Buddhism. The word Chán is derived from the Sanskrit word dhyāna, which can be approximately translated as "meditation" or "meditative state."
Chán developed from the 6th century CE onwards becoming the dominant Buddhist school of China during the Tang and Song dynasties. After the Song, Chán more or less fused with the Pure Land-school.
From China, Chán spread south to Vietnam and east to Korea (where it is known as Seon) and, in the 13th century, to Japan, where subsequent developments took place, and which became the best-known Chán/Zen-tradition in the west.<references>