Zen is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School, and later developed into various sub-schools and branches.
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 teachers often promote diaphragmatic breathing, stating that the breath must come from the lower abdomen (known as hara or tanden in .
Zen was introduced in the United States at the end of the 19th century by Japanese teachers who went to America to serve groups of Japanese immigrants and become acquainted with the American culture.
Though its origins are distant, today there are plenty of prominent American Zen .