A root cellar is a cool, underground storage space used to preserve fruits and vegetables. It takes advantage of the earth's natural insulation to maintain a stable temperature and humidity, which helps prevent spoilage. Commonly used for storing crops like potatoes, carrots, and apples, root cellars can be found in homes, farms, and gardens. These structures can be built into the ground or constructed as separate buildings. They often have ventilation systems to control moisture levels and prevent rot. Root cellars are an ancient method of food preservation, dating back to when people first began to cultivate crops and store them for winter use.