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Dictionary Trading & Markets

Order Book

Also known as limit order market order

An order book is a live list of the buy and sell orders waiting on an exchange for a particular trading pair, organised by price. Buy orders, or bids, sit on one side and sell orders, or asks, on the other. A market order fills immediately against the best available prices, while a limit order waits until the market reaches a chosen price. The depth of the book shows how much liquidity is available.

Written by our editors · Updated October 15, 2026

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