24K gold refers to gold that is 99.9% pure, making it the highest quality of gold available. The "K" stands for karat, a unit of measurement used to indicate the purity of gold. Unlike lower karat gold, such as 18K or 14K, which contain other metals mixed in, 24K gold is free from alloys, giving it a rich yellow color and a soft texture. Due to its softness, 24K gold is often not used for everyday jewelry, as it can scratch and bend easily. Instead, it is commonly found in gold bullion, coins, and high-end jewelry pieces. Its high purity makes it a popular choice for investment and luxury items.