Aluminum foil and aluminum sheet are both made from the same material, aluminum, but they differ in thickness and usage. Aluminum foil is very thin and flexible, typically used for food packaging, cooking, and insulation due to its light weight and heat conductivity. It is also non-reactive, making it suitable for food storage. On the other hand, aluminum sheet is thicker and stronger, often used in construction, automotive, and aerospace industries for its durability and strength-to-weight ratio. It can be used for manufacturing parts, structural components, and decorative purposes.