Short selling, also known as "bulls", refers to speculators buying futures in advance when they estimate that the market of a futures is bullish (bull market), and then throwing futures out once the price rises to earn the difference. Short selling, also known as "short selling", refers to speculators throwing out futures in advance when predicting a bearish situation in a futures market, and once the price falls, they will make up futures and earn the difference.

The difference between the two is that speculators predict the rise and fall of futures and buy and sell futures in reverse.