They are made of polyurethane foam. They are made of foam, but not always polyurethane foam. The king of polyurethane foam boards was Gordon "Grubby" Clark. When he closed Clark Foam, he left a big void that other technologies (like expanded polystyrene foam, epoxy foam and composite foam) helped to fill.
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Shortboards are typically made from a poly boardblank aslo known as a fiberglass board, there is also epoxy boards, and there is carbon fiber boards which a re much stronger but provide less flex the traditional poly or epoxy.
a blank is basically the core of the surfboard, a big foam block that you shape into the board of your shape and desires.
Surfboards are typically made of fiberglass or wood coated with fiberglass or plastics. Surfboards top layer or finish is highly waxed and polished to reduce drag and improve performance.