How does an exchange work in simple terms

Updated: 7 November 2026

In short: An exchange is a venue where buyers' and sellers' orders meet. The price is the point where someone is willing to buy and someone to sell. If there are more buyers than sellers at the current price, the price rises, and vice versa.

Order book and orders

A limit order queues at the price you choose; a market order fills immediately at the best available price. The gap between the best buy and sell prices is the spread.

Why it matters to a trader

A large order needs opposing liquidity. Hence the idea that price moves toward clusters of stops and orders — the foundation of the Smart Money approach.

Example: where the price comes from

The order book has buyers: 100 coins at $99 and 50 at $98. And sellers: 80 coins at $101 and 200 at $102. While nobody gives way, price stands still. A large buyer arrives and takes 150 coins with a market order: they take all 80 at $101 and another 70 at $102. The last trade went through at $102 — that is the new price. Price moves when someone is willing to pay more or sell for less.

Market and limit orders

A market order fills immediately at the best available price — fast, but during a sharp move you may get a worse price than expected (slippage). A limit order is placed at your price and waits for the market to reach it — the price is guaranteed, the fill is not. A stop-loss usually triggers as a market order, so in very sharp moves the loss can be slightly larger than planned.

What this gives you in analysis

Price is drawn to places where orders have accumulated: above obvious highs sit sellers' stops, below lows sit buyers' stops. That is why price so often pokes through obvious levels and reverses. In Smart Money this is called a liquidity grab, and it is one of the first things worth learning to see on a chart.