Hardtack is a simple type of biscuit or cracker made from flour, water, and sometimes salt. Hardtack is inexpensive and long-lasting. It is used for sustenance in the absence of perishable foods, commonly during long sea voyages, land migrations, and military campaigns. Along with salt pork, hardtack was a standard ration for many militaries and navies throughout the 17th, 18th, and 19th centuries.
