Gold foil is a thin sheet of gold that is often used in art, decoration, and various crafts. It is made by hammering gold into very thin layers, which can be as thin as 0.1 micrometers. This process allows the gold to be flexible and easy to apply to surfaces, giving a luxurious appearance. In addition to its decorative uses, gold foil is also utilized in electronics and cosmetics. In electronics, it can be found in connectors and circuit boards due to its excellent conductivity. In cosmetics, gold foil is sometimes used in face masks and skincare products for its perceived anti-aging benefits.