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Order book depth chart on a currency exchange. The x-axis is the unit price, the y-axis is cumulative order depth. Bids (buyers) on the left, asks (sellers) on the right.

An order book is the list of orders (manual or electronic) that a trading venue (in particular stock exchanges) uses to record the interest of buyers and sellers in a particular financial instrument. A matching engine uses the book to determine which orders can be fully or partially executed.