Buddhism has set the unfortunate theory that there are a cause and an effect in formation of things on the fundamental view.
The result arises in the act and action of a life (three acts made by the body, language, and the heart).
The contents of the result are divided into good behavior and the wrongdoing (good deeds bear good fruit and bad cause bad effect), and he recommends people to stack good behavior, without making the wrongdoing.
Moreover, a result is accumulated and the way of life of a next world is determined.
People have repeated this.
This is called Samsara transmigration by Buddhism.
Unless spiritual enlightenment is realized, Samsara transmigration continues.
Samsara, transmigration, and the thought of deliverance are seen by the religion and philosophy of the India origin.
It is the Buddhistic feature to have reorganized Samsara and deliverance based on the unfortunate theory.
This world is filled to pain.
And things [ all ] are based from the cause and the effect.
A cause exists also in people's pain.
Therefore, if the cause of pain is removed, people can slip out of pain.
This is a deliverance theory in Buddhism.
Moreover, in Buddhism, existence of an eternal immortal soul (art man) is denied by the "empty" concept.
It is explained that Samsara is the process of happening also during survival of a life.
This differs from the Samsara concept in the thought and philosophy before Buddhism greatly.
It generates at the place where the recognition function which constitutes the heart is different from a lifetime.
Regardless of physical distance, the consciousness after this lifetime and transmigration is presupposing that causal relationship is maintained and continued.
By the continuity (cardiac inheritance and citta-santana) of this heart, it is not 断滅, either and explains the centrist Samsara transmigration which is not permanent residence, either.