"Caodong" is a term used in Zen Buddhism to refer to a particular lineage of Chan Buddhism. It originated in China and was later introduced to Japan, where it became known as the "Soto" school. Synonyms for "caodong" include "Soto Zen," "Chan Buddhism," "Dongshan school," and "Cao-Dong school." These terms all refer to the same lineage within Zen Buddhism that emphasizes "just sitting" as a meditative practice and places emphasis on the intimate relation between teacher and student. Whether called caodong or Soto Zen, the traditions and teachings of this lineage continue to be influential in the world of Zen Buddhism today.