Tuṣita (Sanskrit) or Tusita (Pāli) is one of the six deva-worlds of the Kāmadhātu, located between the Yāma heaven and the heaven. Like the other heavens, is said to be reachable through meditation. It is the heaven where the Bodhisattva Śvetaketu (Pāli: Setaketu, "White Banner") resided before being reborn on Earth as Gautama, the historical Buddha; it is, likewise, the heaven where the Bodhisattva Nātha ("Protector") currently resides, who will later be born as the next Buddha, Maitreya.
Most Buddhist literature holds that Queen Maya died seven days after the birth of her son the Buddha, and was then reborn in the Tushita Heaven. Seven years after the Buddha's enlightenment, she came down to visit Tavatimsa Heaven, where the Buddha later preached the Abhidharma to her.
In Hinduism, the tushitas are referred to as one of the nine gana deities: adityas, visvedevas, vasus, tushitas, abhasvaras, anilas, maharajikas, sadhyas, and the rudras.
Like all heaven realms in Buddhism, the Heaven is the residence of divine beings or devas. According to the Visakhuposatha Sutta of the Pali Canon, time runs much differently than on Earth:
That which among men is four hundred years, Visakha, is one night and day of the Tusita devas, their month has thirty of those days, their year twelve of those months; the lifespan of the Tusita devas is four thousand of those heavenly years...
In Mahayana Buddhist thought, the Heaven is where all Bodhisattvas destined to reach full enlightenment in their next life dwell for a time. One such reference can be found in the Larger Sutra of Immeasurable Life, a Mahayana text:
Each of these bodhisattvas, following the virtues of the Mahasattva Samantabhadra, is endowed with the immeasurable practices and vows of the Bodhisattva Path, and firmly dwells in all the meritorious deeds. He freely travels in all the ten quarters and employs skillful means of emancipation. He enters the treasury of the Dharma of the Buddhas, and reaches the Other Shore. Throughout the innumerable worlds he attains Enlightenment.