Secondary sales refer to the resale of products or assets after their initial purchase. This often occurs in markets like real estate, art, or collectibles, where items can change hands multiple times. The original seller is typically not involved in these transactions, and the price may vary based on demand and condition. In the context of financial markets, secondary sales involve the buying and selling of securities, such as stocks and bonds, after they have been issued. This market provides liquidity, allowing investors to trade their holdings without affecting the original issuer directly.