A stock broker is a professional who buys and sells stocks and other securities on behalf of clients. They act as intermediaries between investors and the stock market, helping individuals and institutions make informed decisions about their investments. Stock brokers can work for large firms or operate independently, and they often provide advice on market trends and investment strategies. To become a stock broker, individuals typically need to pass licensing exams and have a strong understanding of financial markets. Many brokers also hold degrees in finance or business. Their services can include managing investment portfolios, executing trades, and providing research on various stocks and securities.