Final answer:
Liza is using an organizational chart to help employees understand how they and their jobs fit within the broader organization.
Step-by-step explanation:
When Liza, the trainer, uses a visual representation to explain the formal structure of an organization to the trainees, she is using an organizational chart. An organizational chart is a visual tool that shows how different roles and positions fit together within the organization, helping employees understand their jobs and how they fit within the broader organization. It illustrates the hierarchy of authority, the chain of command, and the relationships between different departments or teams.