BidThe price that a market participant is prepared to pay at a particular time to buy a commodity.
AskThe price that a market participant is prepared to pay at a particular time to sell a commodity.
When a new contract is trading, the bid and ask cells will be highlighted. In this picture, ZU7 is trading. For ZU7, bid starts from 6500.0 and ask from 6443.0. Buyers and sellers will negotiate until bid and ask rich the same value. When this occurs the trading will take place.