Aluminum coil and aluminum foil are both made from aluminum but differ in thickness and applications. Aluminum coil is a flexible and continuous roll of aluminum, typically thicker and stronger than foil, used in manufacturing processes such as construction, packaging, and automotive parts. It can be easily cut and shaped. Aluminum foil, on the other hand, is a very thin and lightweight material, often used for food packaging, cooking, and insulation due to its excellent barrier properties against air, moisture, and light. It's less durable than coil and is not typically used in structural applications.