"Buddhism (/ˈbʊdɪzəm/, US: /ˈbuːd-/) is an Indian religion based on a series of original teachings attributed to Gautama Buddha. It originated in ancient India as a Sramana tradition sometime between the 6th and 4th centuries BCE, spreading through much of Asia. It is the world's fourth-largest religion with over 520 million followers, or over 7% of the global population, known as Buddhists. Buddhism encompasses a variety of traditions, beliefs and spiritual practices largely based on the Buddha's teachings (born Siddhārtha Gautama in the 5th or 4th century BCE) and resulting interpreted philosophies. Two major extant branches of Buddhism are generally recognized by scholars: Theravāda (Pali: "The School of the Elders") and Mahāyāna (Sanskrit: "The Great Vehicle").

As expressed in the Buddha's Four Noble Truths, the goal of Buddhism is to overcome suffering (duḥkha) caused by desire and ignorance of reality's true nature, including impermanence (anicca) and the non-existence of the self (anattā). Most Buddhist traditions emphasize transcending the individual self through the attainment of Nirvana or by following the path of Buddhahood, ending the cycle of death and rebirth. Buddhist schools vary in their interpretation of the path to liberation, the relative importance and canonicity assigned to the various Buddhist texts, and their specific teachings and practices. Widely observed practices include taking refuge in the Buddha, the Dharma and the Sangha, observance of moral precepts, Buddhist monasticism, Buddhist meditation, and the cultivation of the Paramitas (perfections, or virtues).

Theravada Buddhism has a widespread following in Sri Lanka and Southeast Asia such as Cambodia, Laos, Myanmar and Thailand. Mahayana, which includes the traditions of Pure Land, Zen, Nichiren Buddhism, Shingon and Tiantai (Tendai), is found throughout East Asia such as China, Japan, Korea, Vietnam, Taiwan and Singapore. Vajrayana, a body of teachings attributed to Indian adepts, may be viewed as a separate branch or as an aspect of Mahayana Buddhism. Tibetan Buddhism, which preserves the Vajrayana teachings of eighth-century India, is practised in the countries of the Himalayan region, Mongolia, and Kalmykia."

          (from Wikipedia)