What the stock market actually is

The stock market is a system where shares of companies are bought and sold between investors. When you buy a share, you own a small piece of that company. The price of a share moves up and down based on what other investors think the company is worth right now — not what it will be worth tomorrow or next year, but what they will pay for it today.

The major U.S. stock markets are the New York Stock Exchange (NYSE) and the NASDAQ. These are physical and electronic marketplaces where trades happen. You do not go there yourself; instead, you place an order through a brokerage firm, which is a company licensed to buy and sell stocks on your behalf. Your brokerage holds your shares and handles the paperwork.

Stock prices change constantly during trading hours — 9:30 a.m. to 4 p.m. Eastern time on weekdays. The price you see on your screen is the last price at which someone bought or sold that stock. If you place an order to buy, you might get a different price by the time your order goes through, depending on how fast the market is moving and what type of order you place.

Key Takeaways

  • Buying a stock means you own a small piece of a company, and the price moves based on what investors will pay for it right now.
  • You buy and sell stocks through a brokerage firm, which is licensed to trade on your behalf and holds your shares.
  • Stock prices change during market hours (9:30 a.m. to 4 p.m. Eastern, weekdays), and the price you pay depends on when your order reaches the market.
  • Stocks can pay dividends (a share of company profits) or you can make money by selling at a higher price than you paid, but you can also lose money if the price falls.
  • The stock market is not a savings account — money you invest can go down as well as up, and you should only invest money you can afford to lose.

How you make or lose money on stocks

There are two ways to make money from owning a stock. The first is capital appreciation: you buy a share at one price and sell it later at a higher price. The difference is your profit. If you buy at $50 and sell at $75, you make $25 per share (minus any fees your brokerage charges).

The second way is dividends. Some companies pay a portion of their profits to shareholders on a regular schedule — often quarterly or annually. If a company pays a $2 annual dividend and you own 100 shares, you receive $200 per year. Not all stocks pay dividends; many growing companies reinvest all profits back into the business instead.

You lose money when the price falls below what you paid. If you buy at $50 and the price drops to $30, you have a loss of $20 per share. You do not actually lose that money until you sell — until then, it is an "unrealized loss" on paper. But if you need the money and have to sell at $30, the loss becomes real. You can also lose money to brokerage fees, which vary by firm.

The difference between stocks and bonds

A stock represents ownership in a company. A bond is a loan you make to a company or government. When you buy a bond, you are lending money, and the issuer promises to pay you back with interest on a set schedule. Bonds are generally considered less risky than stocks because the payment is promised in advance, whereas stock prices depend entirely on market opinion.

If a company goes bankrupt, bondholders get paid before stockholders. Stockholders may lose everything; bondholders may recover some or all of their money. On the other hand, stocks have historically returned more over long periods, while bonds provide steadier, smaller returns. Many investors own both to balance risk and reward.

What moves stock prices

Stock prices move based on supply and demand — how many people want to buy versus how many want to sell. Several things influence that demand. Company earnings reports matter: if a company reports higher profits than investors expected, the stock often rises. If earnings disappoint, it often falls. News about the company also moves prices: a new product launch, a lawsuit, a change in leadership, or a major contract can all shift investor opinion.

Broader economic news affects stocks too. If interest rates rise, investors may move money out of stocks and into bonds or savings accounts, pushing stock prices down. If the economy is growing and unemployment is low, investors tend to be more confident and buy more stocks. Market sentiment — the overall mood of investors — can push prices up or down even when company-specific news has not changed.

Past performance does not predict future results. A stock that rose 50% last year may fall 30% this year. The market can be unpredictable in the short term, which is why financial professionals often recommend holding stocks for years rather than trading frequently.

How to buy your first stock

To buy a stock, you need a brokerage account. You open one by choosing a brokerage firm — examples include Fidelity, Charles Schwab, E*TRADE, and Vanguard — and providing personal information and proof of identity. The process is similar to opening a bank account and usually takes a few minutes online.

Next, you fund your account by transferring money from your bank. Most brokerages let you link your checking or savings account and move money electronically. Some require a minimum deposit; others do not. Once the money is in your brokerage account, you can place an order to buy a stock.

You search for the stock by company name or ticker symbol (a short code like AAPL for Apple or MSFT for Microsoft). You enter how many shares you want to buy and what type of order you want to place. A market order buys when ready at the current price. A limit order buys only if the price drops to a level you set. After you confirm, the order goes to the market, and if it fills, the shares appear in your account.

Why the stock market matters to regular people

Many people invest in stocks through retirement accounts like a 401(k) or IRA, where contributions may reduce your taxes and grow without being taxed until you withdraw them. Others invest in individual stocks or stock mutual funds to build wealth over time. Even if you never buy a single stock yourself, the stock market affects you: it influences interest rates on mortgages and car loans, it determines whether companies hire or lay off workers, and it shapes the overall health of the economy.

Understanding how stocks work helps you make informed decisions about your own money, whether you are choosing investments for a retirement account or deciding whether to invest in individual companies. It also helps you understand financial news and why markets move the way they do.

Risk and how to think about it

The stock market is not a savings account. Money you invest can go down as well as up. If you invest $10,000 and the market drops 20%, your account may show $8,000. You should only invest money you will not need for several years, because short-term market swings can be large and unpredictable.

Different stocks carry different levels of risk. Large, established companies like Apple or Coca-Cola tend to be less volatile — their prices move less dramatically — than smaller, newer companies. Diversification — owning many different stocks or funds rather than putting all your money in one company — reduces the risk that a single bad event will wipe out your investment.

Many people reduce risk by investing in index funds or mutual funds, which own dozens or hundreds of stocks at once. This spreads your money across many companies, so a drop in one stock does not hurt as much. These funds are often recommended for people who are new to investing or who do not want to research individual companies.

Frequently Asked Questions

Can I lose more money than I invested in stocks?

If you buy stocks with cash, no — the worst that can happen is the stock price falls to zero and you lose your entire investment. However, if you borrow money to buy stocks (called "buying on margin"), you can lose more than you invested because you owe the borrowed money back regardless of what happens to the stock price. Most new investors should avoid margin trading.

Do I have to watch the stock market every day?

No. In fact, checking your account constantly can encourage you to make emotional decisions based on short-term price swings. Many successful long-term investors check their accounts only a few times per year. If you are investing for retirement decades away, daily price changes are noise, not signal.

What is a stock split?

A stock split is when a company divides its shares into more pieces. If you own 100 shares at $100 each and the company does a 2-for-1 split, you now own 200 shares at $50 each. Your total value stays the same, but you own more shares at a lower price. Companies do this to make shares seem more affordable to new investors.

How much money do I need to start investing?

Many brokerages have no minimum deposit, and you can buy a single share of most stocks. Some stocks trade for under $10 per share. However, starting with a small amount means you will pay a larger percentage in brokerage fees, so many people wait until they have at least a few hundred dollars to invest. Check your chosen brokerage's fee structure before you start.

Is the stock market the same as the economy?

No, though they are connected. The stock market reflects what investors think the economy will do, not what it is doing right now. The market can rise while the economy is weak, or fall while the economy is strong, because investors are always betting on the future. The market is also only one part of the economy — it does not include real estate, small businesses, or wages.