Answer:
Project sponsor is an important gear that drive a project to a successful end. She has the power to approve or disapprove changes in order to keep projects aligned with business strategy.
Project sponsor is accountability for the project. She acts as the link between the project, the business community, and strategic level decision-making groups.
Project sponsor seeks to promote the project to keep it high on the priority list, ensures the resources are in place to perform the project, and approves changes to the project.