Buddhist Doctrine is a set of teachings and beliefs that are based on the teachings of Siddhartha Gautama, also known as the Buddha. ZEN is a school of Mahayana Buddhism that emphasizes the practice of meditation and insight into the nature of existence. It is believed to have originated in China during the 6th century CE and was brought to Japan in the 12th century. ZEN is a form of Buddhism that focuses on the practice of meditation and mindfulness. It is often associated with the idea of enlightenment and inner peace.