Pesach, also known as Passover, is a holiday commemorating the story of Yesiat Misraim (Exodus from Egypt). It is an eight-day holiday and during this holiday we eat Matza (unleavened bread). On the first two night of the holiday, we have the Seder, which is the special ceremony that tells the story of Yesiat Misraim. The story is read from the Haggadah and during the ceremony we eat special kinds of food and drink four cups of wine. During Pesach, we have special Torah reading for all of the days in the morning prayers.
To hear the Hallel and different versions of Odekha Ki Anitani click here.