Sōtō Zen or the Sōtō school is the largest of the three traditional sects of Zen in Japanese Buddhism. It is the Japanese line of the Chinese Cáodòng school, which was founded during the Tang dynasty by Dòngshān Liánjiè. It emphasizes Shikantaza, meditation with no objects, anchors, or content. The meditator strives to be aware of the stream of thoughts, allowing them to arise and pass away without interference.

Chan, from Sanskrit dhyāna, is a Chinese school of Mahāyāna Buddhism. It developed in China from the 6th century CE onwards, becoming especially popular during the Tang and Song dynasties.