Passover (Pesach)

Passover is an important, biblically derived Jewish holiday. Passover is celebrated as a commemoration of their liberation by God from slavery in Egypt and their freedom as a nation under the leadership of Moses. It commemorates the story of the Exodus as described in the Hebrew Bible especially in the Book of Exodus, in which the Israelites were freed from slavery in Egypt.  It is one of the most widely observed Jewish holidays.

When the Pharaoh freed the Israelites, it is said that they left in such a hurry that they could not wait for bread dough to rise. In commemoration, for the duration of Passover no leavened bread is eaten, for which reason Passover was called the feast of unleavened bread in the Torah or Old Testament. Thus matzo (flat unleavened bread) is eaten during Passover and it is a tradition of the holiday. 

Passover Seder is a Jewish ritual feast that marks the beginning of the Jewish holiday of Passover.  Passover lasts for 7 days in Israel and 8 days outside of Israel (other than for adherents of Reform Judaism for whom Passover is 7 days regardless of location).  Seder customs include telling the story, discussing the story, drinking four cups of wine, eating matza, partaking of symbolic foods placed on the Passover Seder Plate, and reclining in celebration of freedom. The Seder is performed in much the same way by Jews all over the world. The Seder is the most commonly celebrated of Jewish rituals

A Passover seder is a service held at home as part of the Passover celebration. It is always observed on the first night of Passover and in many homes, it is observed on the second night as well. Participants use a book called a haggadah to lead the service, which consists of storytelling, a seder meal, and concluding prayers and songs.  The word haggadah comes from a Hebrew word meaning "tale", and it contains an outline or choreography for the seder.  The word seder literally means "order" in Hebrew, and there's a very specific "order" to the seder service and meal.