Passover lasts 7 days in the Land of Israel and 8 days in the Diaspora. On Pesach they eat matzo - unleavened bread, the Torah strictly forbade the use of "chametz" (leavened) - products made from dough or based on grains, resulting from leaven or fermentation, during all the days of Pesach. The central event of the Pesach holiday is the first evening when they arrange a special festive meal - the Passover Seder - and retell the story of the holiday, reading the Passover Haggadah.