The institutions and religious doctrine of Buddhists, which is a characteristic of Tibet and places like Nepal, Bhutan and Ladakh, Sikkim and Arunachal Pradesh of India and certain regions in the Himalayas forms Tibetan Buddhism. People practicing Tibetan Buddhism are also observed in certain parts of Russia like Tuva, Buryatia and Kalmykia, in countries like Mongolia and Northeastern China.
It is basically divided into four traditions namely, Nyingma, Kagyu, Gelug and Sakya. These schools include the teachings of the three Buddhism vehicles that are the foundational vehicle, the Mahayana and the Vajrayana. In Gelug, however, Vajrayana is considered to be a part of Mahayana.
