Ship biscuit, also known as hardtack, is a type of dry, hard bread that was commonly used as a staple food for sailors and soldiers during long voyages and campaigns. Made from flour, water, and salt, it was baked until it became very hard, allowing it to be stored for extended periods without spoiling. Due to its durability, ship biscuit was an essential part of maritime and military rations from the 16th century onward. While it was not particularly tasty, it provided necessary calories and could be softened by soaking in water or broth, making it more palatable for those at sea or in the field.