Hardtack is a simple type of biscuit made from flour, water, and salt. It is baked until hard and dry, making it a long-lasting food source. Historically, hardtack was a staple for sailors and soldiers, as it could withstand long journeys without spoiling. Due to its durability, hardtack was often used during military campaigns, especially in the American Civil War. While it provided essential carbohydrates, its tough texture made it difficult to eat without soaking or softening it first. Despite its unappealing nature, hardtack played a crucial role in sustaining people during challenging times.