When the authors of academic papers are jointly completed by many people, it is necessary to determine one of them as the corresponding author of the paper.

The first author is the author of the first signature of the paper. Generally speaking, when evaluating professional titles and graduating from master's degree, it is required to publish papers with the first author. Co-author refers to the author who is in a cooperative relationship in a project, such as the cooperation between several departments and research or the cooperation between departments and universities. Correspondents are equivalent to the first author, and usually they are mentors or leaders in research.