Bardo

In some schools of Buddhism, bardo (Classical Tibetan: བར་དོ་ Wylie: bar do) or antarābhava (Sanskrit, Chinese and Japanese: 中有, romanized in Chinese as zhōng yǒu and in Japanese as chū'u) is an intermediate, transitional, or liminal state between death and rebirth. The concept arose soon after Gautama Buddha's death, with a number of earlier Buddhist schools accepting the existence of such an intermediate state, while other schools rejected it.
That is to say that during the so-called third Council in Pataliputra (Patna) the Asokan section of early Buddhism rejected this concept of àntāra-bháva. Some of those monks who, during this Council, were disrobed and sent away re-introduced it in Hybrid Sanskrit manuscripts. Franklin D. Edgerton mentions àntarābhávika in the Bodhisatttva-bhumi: "someone living in the intermediate state", and àntarābháva in the Làlita-vistára and Abhidhárma-kosa.
The concept of antarābhava was brought into Buddhism from the Vedic-Upanishadic (later Hindu) philosophical tradition. Later Buddhism expanded the bardo concept to six or more states of consciousness covering every stage of life and death. In Tibetan Buddhism, bardo is the central theme of the Bardo Thodol (literally Liberation Through Hearing During the Intermediate State), the Tibetan Book of the Dead, a text intended to both guide the recently deceased person through the death bardo to gain a better rebirth and also to help their loved ones with the grieving process.
Used without qualification, "bardo" is the state of existence intermediate between two lives on earth. According to Tibetan tradition, after death and before one's next birth, when one's consciousness is not connected with a physical body, one experiences a variety of phenomena. These usually follow a particular sequence of degeneration from, just after death, the clearest experiences of reality of which one is spiritually capable, and then proceeding to terrifying hallucinations that arise from the impulses of one's previous unskillful actions.…