Apart from the
apparent physical domain, Hinduism believes there are many other levels of
existence.
The hells are one of these parallel planes of existence, and
they are said to be locations of retribution for one's previous transgressions.
Traditional Hindu traditions depict the hells in
considerable detail, often tying specific punishments to specific sins.
Life in hell, like life in paradise, is ultimately
temporary, but the period of punishment is often characterized as
excruciatingly lengthy and agonizing.
Even yet, after the punishment period has passed and one's
terrible crimes have been atoned for, one will be reincarnated in a higher
form.
Naturally, birth in any of the hells should be avoided if at
all possible, which is why individuals are encouraged to conduct penances
(prayashchitta) for their crimes while they are still alive, so that the
repercussions of their misdeeds do not burden them in their subsequent
lifetimes.
You may also want to read more about Hinduism here.
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