Generally there are two main steps to shradh- Pind daan and Brahman Bhojan. After death, the deceased person goes to Devlok or Pitrulok as per the law of karma. Upon calling by the way of chanting mantras, they come to the place of Shradh from their respective lokas and accept the food which is offered to the Brahmins. The Brahmins are the medium through which they receive food. Since the deceased possess subtle bodies, by consuming subtler and fine particles of food, their hunger is satiated.