It is called samsara . Karma is the accumulated sum of ones good and bad deeds. Karma determines how you will live your next life. Through pure acts, thoughts and devotion, one can be reborn at a higher level. Eventually, one can escape samsara and achieve enlightenment.
Bad deeds can cause a person to be reborn as a lower level, or even as an animal.
The unequal distribution of wealth, prestige, suffering are thus seen as natural consequences for one's previous acts, both in this life and in previous lives. This is the most important of the three. Meditation is often practiced, with Yoga being the most common. Other activities include daily devotions, public rituals, and puja, a ceremonial dinner for a God. Hinduism has a deserved reputation of being highly tolerant of other religions.