Stock Market 101

What Is the Stock Market, Really?

The stock market isn't one building or one website — it's a network of exchanges where people buy and sell tiny ownership slices of companies, called shares. When you own a share of Apple, you technically own a sliver of Apple's factories, patents, and future profits.

In the US, the two biggest exchanges are the New York Stock Exchange (NYSE) and the NASDAQ. Both are regulated by the Securities and Exchange Commission (SEC), which exists to keep trading fair and force companies to disclose accurate financial information.

How a Trade Actually Happens

You don't call up Apple to buy its stock. Instead, the process runs through a chain of players:

• You place an order through a brokerage app (Fidelity, Schwab, Robinhood, etc.)
• The brokerage routes your order to an exchange or market maker
• The exchange matches your buy order with someone else's sell order
• The trade settles — ownership officially transfers, usually within one business day

This entire process now takes milliseconds, but the settlement (the legal transfer of ownership) takes a bit longer to finalize behind the scenes.

Why Do Stock Prices Move?

At the simplest level: more buyers than sellers pushes a price up, more sellers than buyers pushes it down. What drives buyers and sellers to act is usually one of these:

• Company earnings reports (did they make more or less money than expected?)
• Economic data (inflation, interest rates, jobs reports)
• News about the company (new product, lawsuit, CEO change)
• Broader market sentiment (fear or optimism about the economy)

Key Terms to Know Before You Trade

Term	What It Means
Ticker	The short code for a stock, like AAPL for Apple
Bid / Ask	The highest price a buyer will pay / lowest price a seller will accept
Market Order	Buy or sell immediately at the current price
Limit Order	Buy or sell only at a price you set
Volume	How many shares traded in a given period

Key takeaway: the stock market is just a matching system for buyers and sellers of company ownership. Prices move on new information, and every trade you place gets routed through a brokerage to an exchange before it settles.

Frequently Asked Questions

Do I need a lot of money to start investing?

No. Most US brokerages now offer fractional shares, letting you buy a portion of a stock like Amazon or Google for as little as $1.

Is the stock market the same as the economy?

Not exactly. The market reflects investor expectations about future company profits, which can move differently than current economic conditions like unemployment or GDP.

What's the difference between NYSE and NASDAQ?

NYSE is the older, larger exchange known for blue-chip and industrial companies. NASDAQ is fully electronic and is home to most major tech companies like Apple, Microsoft, and Amazon.