The Order Book is a fundamental element or module on the Phemex Trading Page.
It is simply an electronic book or list of all the buy and sell orders updated in real-time. It displays the best-priced Sell Orders* (in red) and the best-priced Buy Orders* (in green). Under the Price Column, prices are arranged from highest to lowest for both Buy and Sell orders. The Size Column shows how many contracts are offered at each price, while the Total Column shows how much demand is present for each price.
*Please note that you can view more orders by expanding the table from the bottom-right corner of the order book.