Within Buddhism, jhana can be a series of carefully cultivated and developed states of mind. These states cumulatively lead to what is called upekkhii-sati-piirisuddhi, or "perfect mental awareness and equanimity."
This final state of jhana is said to bring an abandonment of both pleasure and stress, where the yogi feels neither sensation. Instead, they are permeated by the light of bright, pure awareness. This can only be experienced once the yogi has passed through the initial three stages of jhana where they withdraw their senses, still their thoughts and cultivate equanimity.
Some say that in order to experience one of the states of jhana, it is necessary to transcend all desire, craving and doubt. It is only when a yogi is in a wholesome state of mind that it is possible to find jhana. Others say that mastering jhana is a mark of wisdom.