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Zen (Japanese; from Chinese "Chán"; in Korean: Sŏn, and Vietnamese: Thiền) is a school of Mahayana Buddhism that originated in China during the Tang dynasty as the Chan School (禪宗, chánzōng, "meditation school") or the Buddha-mind school (佛心宗, fóxīnzōng), and later developed into various sub-schools and branches. Zen was influenced by Taoism, especially Neo-Daoist thought, and developed as a distinguished school of Chinese Buddhism. From China, Chán spread south to Vietnam and became Vietnamese Thiền, northeast to Korea to become Seon Buddhism, and east to Japan, becoming Japanese Zen.

Zen emphasizes meditation practice, direct insight into one's own Buddha nature (見性, Ch. jiànxìng, Jp. kenshō), and the personal expression of this insight in daily life for the benefit of others. Some Zen sources de-emphasize doctrinal study and traditional practices, favoring direct understanding through zazen and interaction with a master (Jp: rōshi, Ch: shīfu) who may be depicted as an iconoclastic and unconventional figure. In spite of this, most Zen schools also promote traditional Buddhist practices like chanting, precepts, rituals, monasticism and scriptural study.

With an emphasis on Buddha-nature thought, intrinsic enlightenment and sudden awakening, Zen teaching draws from numerous Buddhist sources, including Sarvāstivāda meditation, the Mahayana teachings on the bodhisattva, Yogachara and Tathāgatagarbha texts (like the Laṅkāvatāra), and the Huayan school. The Prajñāpāramitā literature, as well as Madhyamaka thought, have also been influential in the shaping of the apophatic and sometimes iconoclastic nature of Zen rhetoric.