Hard bread, often referred to as hardtack, is a type of dry, long-lasting bread made from flour, water, and salt. It is typically baked until it becomes very hard and dry, making it resistant to spoilage. Historically, hard bread was a staple for sailors and soldiers due to its durability and ability to withstand long journeys without refrigeration. This type of bread is usually rectangular or square in shape and can be eaten as is or softened by soaking in water or broth. While it may not be very flavorful, its practicality has made it an important food source in various cultures, especially during times of scarcity or travel.