Used in electronics for reliable, corrosion-resistant connectors and contacts due to excellent conductivity and stability. Common in aerospace and high-end devices like smartphones and computers. Widely used in dentistry for crowns and bridges because of biocompatibility and resistance to tarnish. Key material in jewelry and decorative items for its luster, malleability, and lasting appeal. Employed in medicine, especially in treatments for rheumatoid arthritis and in some cancer therapies using gold nanoparticles. Important in nanotechnology; gold nanoparticles are used in sensors, imaging, and targeted drug delivery. Used as a catalyst in chemical reactions, especially in air purification and carbon monoxide oxidation. Applied in glassmaking to create colored glass and in infrared shielding for windows. Used in central banking and investment as a store of value and hedge against inflation.