The story
The Exodus: the Israelites were slaves in Egypt, Moses demanded their release, and God sent ten plagues on Pharaoh, the last the death of every firstborn. The Israelites marked their doorposts with the blood of a lamb and the destroyer passed over their houses; that is the name. They left in such haste that the bread had no time to rise, and the flat unleavened matzah is eaten for the week in its memory.
The seder (order) is the family meal of the first night, built around the Haggadah, the book that retells the story so that each generation sees itself as having left Egypt. The youngest asks the four questions, four cups of wine are drunk, and the door is opened for Elijah.
