A cheesecake is a dessert cake made of cheese (usually cream cheese but sometimes ricotta), eggs, and sugar. It often has a graham cracker crumb crust, sometimes held together by melted butter. The filling has a very heavy, smooth texture. It sometimes has sour cream to make it easier to shape and may have fruit flavoring such as strawberry, blueberry, or lemon. It is often topped with fresh fruit or chocolate.

Source: Wikipedia