The key ingredients in cheesecake are cream cheese, heavy cream, sour cream, sugar, and eggs, plus any flavorings. No-bake cheesecake is made using the same ingredients except for the eggs. Eggs help to bind and solidify cheesecake, but they are always the reason traditional cheesecake must be baked. No-bake cheesecake doesn't have to be baked since it doesn't contain eggs, and it relies on refrigeration to keep it firm.