Cheesecake is a sweet dessert consisting of one or more
layers. The main, and thickest, layer consists of a mixture of a soft,
fresh cheese (typically cottage cheese, cream cheese or ricotta), eggs,
and sugar.
If there is a bottom layer, it most often consists of a crust or base
made from crushed cookies (or digestive biscuits), graham crackers,
pastry, or sometimes sponge cake. Cheesecake may be baked or unbaked
(and is usually refrigerated).