An orderbook of a market shows a trader the complete list of others who are looking to buy and sell the asset. The orderbook is split into two sections: the bottom half, which lists the bids from highest price at the top to lowest price at the bottom and the top half, which lists the offers from lowest price at the bottom to highest price at the top. Each bid/offer contains information on the amount the trader is looking to buy/sell, the price they are willing to pay/accept and the amount they are looking to buy/sell.

The orderbook is extremely useful to a prospective trader as they are able to evaluate the depth of each side of the market, where larger orders lie and the speed at which orders are getting filled. All of these factors can allow a trader to make a better judgement about what price they are willing to buy/sell an asset at and in which direction they think the market is moving.
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Being able to track and assess an orderbook effectively can give a trader an edge, but is an acquired skill and can be difficult in a fast-moving, liquid market. Therefore, when one starts to consider the number of exchanges that exist, each with their own orderbook for a given pair, the problem becomes even more apparent.

At APEX:E3, we have built a solution for this with our Global Orderbook feature, as shown above.
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More info about the global orderbook feature can be found here