Heart Sutra is the most powerful and famous sutra of Bodhisattva Avalokitesvara (观音菩萨 / 观世音菩萨) especially in Mahayana Buddhism. Mahayana Buddhism spreads throughout countries such as China, Japan, Mongolia, Tibet, Korea, Taiwan, Vietnam, Bhutan and Nepal etc etc although many people in Southeast Asia (ASEAN) countries also Mahayanist.