The chairman is an administrative post. A joint-stock company has a board of directors, a general manager and various management departments. Some important decisions of the company are decided by the board of directors, and the chairman is the person in charge of the board of directors. After the board of directors holds a meeting to decide on important matters of the company, the general manager shall be responsible for their implementation. The director is the representative of the company's investors, and the chairman is the party that contributes the most.
The chairman can only be found in the enterprise, so it is not an administrative position in the enterprise, but a management position.