Hang order, also known as maker, refers to the operation of providing liquidity to the market in order book mode transactions. Order taking, also known as taking, refers to the operation of extracting market liquidity in order book mode transactions. Due to the opposite impact of placing orders and taking orders on market liquidity, most trading platforms have set different levels of fee standards for placing orders and taking orders. Generally speaking, the fee rate for placing orders is lower than that for taking orders.