In Jainism, the soul (jīva) is considered eternal and inherently pure, possessing infinite knowledge, perception, bliss, and energy. However, due to the accumulation of karmic particles (karma) caused by one's actions, the soul is bound to the cycle of birth and death (saṃsāra).

What the soul "does" depends on its state:

1. In the Worldly State (Saṃsāri Jīva):

- The soul takes birth in various forms (human, animal, celestial, or hellish beings) according to its karma. - It experiences pleasure and pain, and engages in activities (thoughts, speech, and actions) that can either accumulate more karma or help shed it. - The ultimate purpose is for the soul to realize its true nature, practice right faith, knowledge, and conduct (Samyak Darshan, Jnana, and Charitra), and gradually purify itself.

1. In the Liberated State (Siddha):

- When the soul completely destroys all karmas, it attains liberation (moksha). - In this state, the soul rises to the top of the universe (Siddhashila) and exists forever in its pure form, experiencing infinite bliss, knowledge, and perception, without any further rebirths.

Therefore, according to Jainism, the soul’s highest pursuit is to purify itself from karmic bondage and achieve liberation. Until then, it continues to cycle through various existences according to its karma.