Buddhism : Buddhism believes in the universality of Karma, which is a result of one's action. Karma is a process, a consequence of one's desire ridden actions that cling to the personality of a being as an impression of its past and determines its future.
Good actions lead to good karma and bad actions to bad karma. One can address the problem of karma by following the teachings of the Buddha, the truths enshrined in the Dhamma and the code of conduct prescribed for the Sangha. The eightfold Path and the Four Noble Truths are the best means to minimize the negative effects of karma and work for salvation.
Jainism : Jainism also believes in the universality of karma and its effect on human beings. But, unlike Buddhism, karma, according to Jainism, is not a mere effect of one's actions, but a real substance that flows into each individual body or jiva. This karmic substance remains with a being until good conduct and self purification eliminates them.
This karmic substance which is a kind of subtle matter or energy field, remains attached to the being until it is fully cleansed through the observation of vows, pure conduct and severe austerities.
2) On Soul:
Buddhism : According to Buddhism, soul is an individuality that does exist in plants and animals, but not in non-living or inanimate things.
Jainism : According to Jainism, soul is present in every animate and inanimate object of the universe including its elements - earth, water, wind, fire and air.
3) On The Status And Evolution of Individual Beings:
Buddhism : After Nirvana, there is no soul, but the individuality of an individual that passes into nothingness, which is beyond any description and speculation.
Buddhism does not believe in the existence of eternal souls. So it approaches the subject of liberation purely from a physical and mental perspective. What becomes liberated during nirvana is the individual personality that comes into existence on account of