Rebirth refers to the teaching that the actions of a person lead to a new existence after death, in an endless cycle called saṃsāra.
The rebirth doctrine, sometimes referred to as reincarnation or transmigration, asserts that rebirth does not necessarily take place as another human being, but can also lead to an existence in one of the six realms of existence, which also include heaven realms, the animal realm, the ghost realm and hell realms
Rebirth, as stated by various Buddhist traditions, is determined by karma, with good realms favored by kushala (good or skillful karma), while a rebirth in evil realms is a consequence of akushala (bad karma)
While nirvana is the ultimate goal of Buddhist teaching, much of traditional Buddhist practice has been centered on gaining merit and merit transfer, whereby one gains rebirth in the good realms and avoids rebirth in the evil realms.
To The Moon
The rebirth doctrine has been a subject of scholarly studies within Buddhism since ancient times, particularly in reconciling the rebirth doctrine with its anti-essentialist anatman (not-self) doctrine