Final answer:
An organizational chart is used to illustrate the hierarchy of a company and show who reports to whom.
Step-by-step explanation:
The method of illustrating the hierarchy of a company by illustrating who reports to whom is an organizational chart. An organizational chart visually represents the structure of a company, showing the different roles and how they are connected. It typically displays who is in charge of whom and provides a clear understanding of the chain of command within the organization.