Stock Market
The stock market is a place where people buy and sell "shares" of companies. When people buy shares, they are buying a piece of the company, and they can make money if the company does well. When the company does well, the price of the shares rises, and people can make money by selling the shares for more than they paid. On the other hand, if the company doesn't do well, the price of the shares can drop, and people can lose money.
Related topics others have asked about:
Asset allocation,
Diversification (finance),
Equity crowdfunding,
Financial risk management,
Modeling and analysis of financial markets,
Risk management,
Securities market participants (United States),
Securities regulation in the United States,
Standard deviation,
Stock market bubble,
Stock market crash,
Stock market cycles