The Sanskrit preta simply means departed or deceased, and the term predates the elaborate Buddhist cosmology that later gave it teeth and a needle throat. In the older Vedic frame, a preta was any spirit of the recently dead who had not yet completed the rites, principally the shraddha offerings, that transform an ancestor into a settled, benevolent pitri. An unfed or improperly mourned dead person could linger as a preta indefinitely, which is why Hindu funerary practice still centers on feeding the dead through ritual offerings of rice balls, pinda, over a fixed period after death. Buddhist doctrine absorbed this figure and re-explained its cause: instead of an accident of incomplete ritual, hungry-ghost status became a direct karmic consequence of stinginess, so the preta shifted from a family's unfinished obligation to the deceased's own moral history.
The figure then travelled with Buddhism across Asia and localized freely: the Chinese e gui absorbed indigenous ancestor-spirit beliefs and gave the tradition the Ghost Festival, and Thai and Burmese Theravada folklore developed its own pret, sometimes imagined as towering and thin rather than swollen. The throughline across all these regional forms is the same image, a being whose hunger cannot be satisfied by ordinary means and whose relief depends entirely on what the living choose to give.