Hardtack is a type of dry, hard biscuit made from flour, water, and salt. It was commonly used as a long-lasting food source for sailors and soldiers during long journeys or military campaigns. Its durability made it ideal for storage, as it could withstand various weather conditions without spoiling. Typically rectangular in shape, hardtack is known for its tough texture and bland taste. It was often eaten plain or softened in water or broth. Despite its simplicity, hardtack played a crucial role in sustaining troops during conflicts such as the American Civil War and was a staple for many explorers.