Au, commonly known as gold, is a chemical element with the symbol Au and atomic number 79. It is a dense, malleable metal that has been valued for its beauty and rarity throughout history. Gold is often used in jewelry, electronics, and as a form of currency due to its resistance to corrosion and excellent conductivity. Gold is typically found in nature in its native form, often in veins or alluvial deposits. It is extracted through mining processes and can be refined to achieve high purity levels. The metal has significant cultural and economic importance, often symbolizing wealth and prosperity.