Aluminum foil and aluminum sheets are both made of aluminum but differ in thickness and uses. Aluminum foil is very thin, typically less than 0.2mm, and is used for food packaging, cooking, and insulation due to its flexibility and light weight. Aluminum sheets, on the other hand, are thicker, ranging from 0.2mm to several millimeters, and are used in construction, manufacturing, and automotive industries for their strength and durability. Sheets are also more rigid and can be cut and shaped into various forms for structural applications.