What is Market Order?
Crypto Glossary Definition
An order that is executed immediately at the current market price. A market order is generally guaranteed to execute as long as there is any liquidity at all.
Why Market Order Matters
A market order executes immediately at the best currently available price, guaranteeing the trade completes but not the exact price you'll get — on a thin order book, a large market order can fill at a noticeably worse average price than expected (slippage).
Market Order in Practice
A trader watching a breaking news headline about a regulatory crackdown wants out of their altcoin position immediately, before the price falls any further. Rather than setting a limit order at a specific price and risking it never fills as the market drops past it, they place a market order to sell their entire holding right away. The order executes instantly, matching against whatever buy orders are currently sitting in the book, starting with the highest bid and working down through progressively lower ones if the position is large relative to available liquidity. On a heavily traded pair like BTC/USDT this happens with barely any price impact. But this particular altcoin trades on a much thinner order book, and the trader's sell order chews through several price levels before it's fully filled, meaning the average execution price ends up noticeably below the price they saw on screen when they clicked sell — a gap known as slippage. Afterward, reviewing the trade confirmation, they realize a limit order might have gotten a better price on a calmer day, but during a fast-moving panic, guaranteed execution mattered more than getting the best possible price. This trade-off — speed and certainty versus price control — is the core reason both order types exist side by side on every exchange.
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