Currently, it is the state religion of Bhutan and the government in exile of Tibet. It is also practiced in Mongolia and parts of Russia. Recently, the Tibetan Diaspora has actively spread Tibetan Buddhism to many Western countries, where the Buddhist traditions have gained popularity.
After reading about Tibetan Buddhism, an attempt was made to summaries it as an ABC verse by me as follows.
A: Ahimsa or non-violence to be practiced as a way of life with a feeling and behavior of respect for all forms of life and treating "ignorance" or "delusion" (avidya) as a mental state caused by desires; a source of strife or dukkha and the foundation of samsara, becoming, self or ego.
B: Becoming and being treated as bhavas or attitudes or states of mind that denote the continuity of life and death, including reincarnation and the existential maturation arising here from.
C: Cause-and-effect law in Buddhism or karma (action) principle propels towards mindfulness or becoming intentionally aware of one's thoughts and actions in the present moment non-judgmentally or following a mid-path.
D: Deciphering existential purpose of life to release the Buddha nature as the uncreated and deathless element or principle concealed within us to achieve 'Bodhi Awakening' or Nirvana.
E: Eightfold Path to be followed for possible liberation consisting of Right View; Right Thought; Right Speech; Right Action; Right Living; Right Effort; Right Mindfulness; and Right Concentration. Meditation and mantra chant are used primarily to aid right concentration.
In Tibetan Buddhism, the state of being is seen as light which has no form and interpreted as the 'Tathagata of Unhindered Light'. In this religion, the Buddha nature within is assumed as the un-created and deathless element that is innate within all human beings to be awakened through religious practices, meditations and mantras.