Great question! I have found that it really depends on where you are working and how they define project manager. Some organizations use it as a catch all to include activities such as working on corporate strategies, performance improvement, or developing and tracking a performance management system. Traditionally, a project manager manages projects such as new constructions or implementing new processes. They lead a group of diverse team members to design the work that needs to be done, develop a project plan, ensure that the work is being done on time and on budget, work with leadership to remove barriers, conduct any testing of the work to ensure it is stable, develop training, and finally "go live" which means your first day of final implementation.