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 “Sado”.
Zen Buddhism was a primary influence in the development of the Japanese tea ceremony.

Tea gatherings are classified as an informal tea gathering chakai and a formal tea gathering chaji (tea event). 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.