A roshi is a title used in Zen Buddhism to refer to a respected teacher or master. The term translates to "old teacher" and is often given to individuals who have attained a high level of understanding and experience in Zen practice. Roshi typically lead meditation sessions, offer guidance to students, and help them deepen their spiritual practice. In many Zen traditions, a roshi has undergone rigorous training and has often received formal recognition from other masters. They play a crucial role in preserving and transmitting the teachings of Zen, which include practices like zazen (sitting meditation) and koan study, a method of contemplation involving paradoxical questions or statements.