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).