The secondary market, also known as the stock market, provides liquidity to existing financial securities through trading on a stock exchange. It is regulated through processes like stock exchange recognition, security listing, and broker registration. Key functions of the secondary market include providing an ideal meeting place for buyers and sellers, ensuring safety and liquidity for investors, facilitating speculative trading and resource allocation, and disseminating market data. It involves various players like brokers, investors, clearing corporations, depositories, and clearing banks to facilitate trading, clearing, and settlement.