The distinction between a Junior Project Manager and a Project Manager primarily lies in their levels of experience, responsibilities, and decision-making authority. A Junior Project Manager typically has less experience and may assist in various project tasks, while a Project Manager usually has more extensive experience and is responsible for overseeing the entire project lifecycle, making critical decisions, and leading the project team. To summarize, the roles of Junior Project Managers and Project Managers differ significantly in terms of experience and responsibilities. Junior Project Managers often support project activities and learn the ropes, whereas Project Managers take charge of the project, guiding the team and making key decisions.