Tibetan Buddhism is the body of religious Buddhist teachings from Tibet. The form of Buddhism taught in Tibet is mostly of the type called Vajrayana. However, Tibetan Buddhism also has teachings from the earlier forms of Buddhism called Theravada and Mahayana.
Buddhism first came from India into Tibet in 173 CE during the reign of Lha Thothori Nyantsen. However, Buddhism did not grow strong until much later.
In the 8th century, an Indian teacher called Padmasambhava brought Buddhism to Tibet again while Trisong Detsen was king of Tibet. Padmasambhava (more commonly known as Guru Rinpoche) merged Buddhism with the local Bön religion to create Tibetan Buddhism. He also wrote a number of important texts.
Tibetan Buddhism has four main schools. Two of these schools hold practice as more important and two hold scholasticism (study of philosophy) more important.