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A stock exchange is a regulated marketplace where buyers and sellers of shares meet. The two largest in the United States are the New York Stock Exchange (NYSE) and the Nasdaq — the NYSE historically used a hybrid of floor traders and electronic systems, while the Nasdaq has always been fully electronic. Most developed countries have their own major exchange, such as the London Stock Exchange or the Tokyo Stock Exchange.
When you place an order to buy a share, it doesn't go straight to the company — it goes to the exchange (or your broker routes it there), where it's matched against other traders' sell orders at a price both sides agree on. This matching process happens automatically and in fractions of a second for actively traded stocks, using an order book that lists every current buy and sell order at every price level.
Exchanges exist to make this matching process fair, transparent, and liquid. Listing on a major exchange requires a company to meet ongoing rules around financial reporting and corporate governance, which is part of why investors generally trust exchange-listed prices as a fair reflection of what a stock is currently worth.
Liquidity — how easily a stock can be bought or sold without moving its price much — varies a lot between listings. Large, well-known companies (often called "blue chips") tend to have thousands of buyers and sellers active at any moment, keeping the bid-ask spread tight. Smaller, thinly traded stocks can have wide spreads and sharp price jumps on relatively small orders, which is an important risk to understand before trading them.
Real-World Example
A trader clicks buy on 100 shares of a blue-chip stock on the NYSE and the order fills in a fraction of a second, matched automatically against a seller's order at a price both sides agree on, invisible, instant, and routine. The same trader then tries to buy shares of a thinly traded small-cap stock and watches the price jump several percent just from their own order hitting a shallow order book, a completely different execution experience purely because of how much liquidity was sitting in each stock's order book at that moment.
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