Freeze-drying is a preservation method that removes moisture from food or other materials while keeping their structure and nutrients intact. The process involves freezing the item and then reducing the pressure around it, allowing the ice to turn directly into vapor in a process called sublimation. This results in lightweight, shelf-stable products. Commonly used for preserving fruits, vegetables, and even meals, freeze-drying helps maintain flavor and nutritional value. Many outdoor enthusiasts and emergency preparedness kits utilize freeze-dried foods for their long shelf life and ease of preparation, making them popular choices for camping and survival situations.