The following is a detailed introduction. I will update this answer slowly. = = Not perfect. Please write privately if you have any suggestions.
High-frequency trading, which is dominated by powerful computer systems and complex operations, can automatically complete a large number of buying, selling and canceling orders within milliseconds. This kind of transaction has a history of at least ten years and is very common in mature markets. However, some people package it as "high-tech" and claim that they can make money stably and without risk with awesome servers.
The existence of a great god in Zhihu has been revealed/Question /29 1 1346 1.