The Japanese tea ceremony, also called the Way of Tea, is a Japanese cultural activity involving the ceremonial preparation and presentation of matcha, powdered green tea. In Japanese, it is called chanoyu or chadi, sadi. The manner in which it is performed, or the art of its performance, is called otemae. Zen Buddhism was a primary influence in the development of the tea ceremony. Tea gatherings are classified as chakai or chaji. A chakai is a relatively simple course of hospitality that includes confections, thin tea, and perhaps a light meal. A chaji is a much more formal gathering, usually including a full-course kaiseki meal followed by confections, thick tea, and thin tea. A chaji can last up to four hours.