Freezers are appliances designed to store food at extremely low temperatures, typically below 0°F (-18°C), to preserve it for long periods. They work by maintaining a cold environment that prevents the growth of bacteria and spoilage. Freezers come in various types, including upright and chest models, and often feature adjustable shelves or bins to organize items. Many modern freezers also offer energy-efficient designs and advanced features like automatic defrost and temperature controls.