Passover is the festival when Jews commemorate and reenact the Exodus from Egypt, their liberation from slavery, and the birth of their nation. For an entire week, they do not eat leavened bread, but unleavened breads (matzot) instead.
During the celebration during Passover night which by Sephardi Jews is called the Haggadá (Ashkenazi Jews call it the Passover "Seder"), one of the events is the Four Questions. See here a video of these Four Questions according to the Sephardi tradition: