Passover is a Jewish holiday celebrated in the spring, usually in April. It celebrates the story of the Exodus, in which Moses led the Jews out of slavery in Egypt. Throughout the eight-day holiday, eating hametz, leavened grain products, is not allowed. Jews are commanded to eat matzo, an unleavened bread resembling a water cracker, on this holiday. On the first two nights of Passover the Seder ritual is performed in which we recount the story of the Exodus, drink four cups of wine and eat a festive meal.