An orderbook is a popular way of organizing trades on a market. An orderbook will display all of the bids and asks (buy and sell orders) for a single security or commodity in an organized manner. For example, suppose a trader wishes to buy shares of Stock A. An orderbook may display that one can buy 600 shares for $44.00/share, 350 shares for $44.01/share, 2500 shares for $44.02/share, etc. The trader can then use the orderbook to decide whether or not or how much to buy of Stock A.