i am using DFN for trading, so when i check "Time and Sales" on a certain stock there is a column called "Side" on that column they defined whether it is a “Buy” or a “Sell” order.
however as i know every "Sell" order is a "Buy" order, every "Buy" order is a "Sell" order(correct me if i am wrong). so how do they define whether it is a “Buy” or a “Sell” order?