What is a Passover Seder? It is a service that retells the Passover story. Seder really means “order,” as this service has 14 parts that are performed in a sequence. The Passover book, which tells the Passover story, is called a Haggadah. The Passover Seder is often held in a family member’s home on the same Hebrew calendar date every year, the 14th day of the month of Nisan. The second Passover Seder during the Passover week is often held in synagogues or Jewish community centers.