https://www.smartdraw.com/organizational-chart/organizational-chart-types.htm
1. To Show Management Structure It shows the management structure of the organization at a glance. It can also show other organizational structures, such as relationships between companies with common or affiliated ownership. 2. To Show Other Organizational Structure Other hierarchies, such as business ownership structures, can be shown using org charts. 3. As a Planning Tool Org charts are used to visualize and plan company reorganizations. 4. An Employee Reference It provides a reference for employees to help them understand their role in the organization, who they report to, and who reports to them. 5. An Employee Directory Adding other information, such as headshots, telephone numbers and email addresses allows the org chart to also function as an employee directory. https://www.pm4dev.com/resources/free-e-books/3-the-project-management-organizationalstructures/file.html