Rebirth refers to a process whereby beings go through a succession of lifetimes as one of many possible forms of sentient life, each running from conception[28] to death, says Wikipedia.
Buddhism rejects the concepts of a permanent self or an unchanging, eternal soul, as it is called in Hinduism and Christianity.
According to Buddhism there ultimately is no such thing as a self independent from the rest of the universe (the doctrine of anatta).
Rebirth in subsequent existences must be understood as the continuation of a dynamic, ever-changing process of "dependent arising" ("pratītyasamutpāda") determined by the laws of cause and effect (karma) rather than that of one being, transmigrating or incarnating from one existence to the next.