The Heart Sūtra, belonging to the Perfection of Wisdom (Prajñāpāramitā) category of Mahāyāna Buddhism literature, is along with the Diamond Sutra, the most prominent representative of the genre.
The Chinese version attribute to Xuanzang (T251) is frequently chanted (in Sino-Xenic pronunciations) by the Chan, Zen, Seon, and Thiền schools during ceremonies in China, Japan, Korea, and Vietnam respectively.