How would the role of a project manager be different in an agile project life cycle, versus a plan-driven or traditional project life cycle?

Flexible (Agile) projects are much more able to modify with the changing requirements and are more flexible in design and can be implemented by the project manager. With the implementation of plan-based projects, management is concerned more about the use of time, costs, and resources and managers would like to monitor the input more closely and have less scope or opportunity to consider the box. The project manager's behavior is more hierarchical in nature and has little versatility in the conventional project life cycle.