In Buddhist traditions, the belief that there is a continuity of mind from one lifetime to the next as an individual incarnates time and again in a quest for spiritual perfection. It is important to note that Buddhist philosophies do not profess a belief in the existence of the individual "soul" and does not interpret 'rebirth' as the soul's literal reincarnation. See also "reincarnation" and "bardo".
being reborn in Samsara due to our ignorance and past Karma; actual interpretations vary from reincarnation of the self to recycling of constituents.
In Buddhism, the belief that there is some continuty of mind from one life to the next. Buddhism, however, does not accept the existence of the individual soul and therefore does not view rebirth as the soul's literal re-incarnation.
after death the soul begins a new cycle of existence in another human body
The corollary of karma. The doctrine that each individual is born into the world again and again to inherit the effects of his deeds, or rather, that by action in this life the individual creates a fresh personality for himself in order that the results of his actions may be fulfilled in a future life.
Rebirth in Buddhism is the doctrine that the consciousness of a person (as conventionally regarded), upon the death or dissolution of the aggregates (skandhas) which make up that person, becomes one of the contributing causes for the arising of a new group of skandhas which may again be conventionally considered a person or individual. The consciousness arising in the new person is neither identical to, nor different from, the old consciousness, but forms part of a causal continuum or stream with it. The basic cause for this persistent re-arising of personality is the abiding of consciousness in avidya (ignorance); when ignorance is uprooted, rebirth ceases.