We need to understand what trading volume is. In market software, there are two indicators that reflect trading volume: one is the trading volume, and the other is the open interest. Here, we will mainly discuss the changes in trading volume when the market starts. First, we need to understand what trading volume is.
Every K-line in any period has a specific trading volume for the time required to form that K-line. The boxed area in the diagram corresponds to the trading volume. Each trading volume bar represents the amount of trading volume: the longer the bar, the greater the trading volume; the shorter the bar, the smaller the trading volume.