What did the position of high priest do in ancient times? Whether or not, I just want to know her role.

A priest, or priest, refers to a person who presides over a sacrifice in order to worship or fear the god he believes in and serves as an auxiliary or main sacrifice on the altar in religious activities or sacrificial activities. According to different beliefs, priests are considered to have different degrees of sacredness. No matter in the actual social function or the mysterious religious level, the priest has irreplaceable importance.