Tibetan Buddhism is the body of Buddhist religious doctrine and institutions characteristic of Tibet and certain regions of the Himalayas, including northern Nepal, Bhutan, and India (particularly in Arunachal Pradesh, Ladakh, Dharamsala, Lahaul and Spiti in Himachal Pradesh, and Sikkim). It is the state religion of Bhutan. It is also practiced in Mongolia and parts of Russia (Kalmykia, Buryatia, and Tuva) and Northeast China. Texts recognized as scripture and commentary are contained in the Tibetan Buddhist canon, such that Tibetan is a spiritual language of these areas.
A Tibetan diaspora has spread Tibetan Buddhism to many Western countries, where the tradition has gained popularity. Among its prominent exponents is the 14th Dalai Lama of Tibet. The number of its adherents is estimated to be between ten and twenty million.
Tibetan Buddhism comprises the teachings of the three vehicles of Buddhism: the Foundational Vehicle, Mahāyāna, and Vajrayāna. The Mahāyāna goal of spiritual development is to achieve the enlightenment of Buddhahood in order to most efficiently help all other sentient beings attain this state. The motivation in it is the bodhicitta mind of enlightenment — an altruistic intention to become enlightened for the sake of all sentient beings. Bodhisattvas are revered beings who have conceived the will and vow to dedicate their lives with bodhicitta for the sake of all beings. Tibetan Buddhism teaches methods for achieving Buddhahood more quickly by including the Vajrayāna path in Mahāyāna.
Buddhahood is defined as a state free of the obstructions to liberation as well as those to omniscience. When, in Buddhahood, one is freed from all mental obscurations, one is said to attain a state of continuous bliss mixed with a simultaneous cognition of emptiness, the true nature of reality. In this state, all limitations on one's ability to help other living beings are removed.
It is said that there are countless beings who have attained Buddhahood. Buddhas spontaneously, naturally and continuously perform activities to benefit all sentient beings. However it is believed that one's karma could limit the ability of the Buddhas to help them. Thus, although Buddhas possess no limitation from their side on their ability to help others, sentient beings continue to experience suffering as a result of the limitations of their own former negative actions.