The abridged 'wiki' version is that Passover commemorates the story of the Exodus, in which the Israelites/Hebrews (Jews are modern decendants) were freed from slavery in Egypt. In the story, God inflicts ten plagues upon the Egyptians - the tenth plague being the killing of every firstborn male. The Hebrews were instructed to mark the doors of their homes with blood of a spring lamb and upon seeing this, the spirit of the Lord passed over these homes. When Pharaoh freed the Hebrews, it is said that they left in such a hurry that they could not wait for bread to rise. In commemoration, for the duration of Passover no leavened bread is eaten, for which reason it is called "The Festival of the Unleavened Bread".
I ate so much produce this past week! And I had a wonderful delivery last tuesday, which included the mango, kiwi and strawberry combo I packed for lunch one day with plain yogurt and a dollop of my homemade strawberry jam (that I made last summer).