The Impartial Rabbis or Bias in the Bet Din

According to Rabbi Yisrael Belsky, “It is rare – almost to the point of being nonexistent – that after one listens to a Dayan, one fails to understand what went on in the be[t] din [or] that he was indeed treated fairly.” What are a Dayan and a Bet Din, and who would possibly feel they were treated unfairly are only some of questions the average person listening to Rabbi Belsky might ask.