Project manager: - Reads Jira (or whatever) and moves things around (yes, they may also add things sometimes, but I'm drawing a general distinction). - Gantt

Project manager: - Reads Jira (or whatever) and moves things around (yes, they may also add things sometimes, but I'm drawing a general distinction). - Gantt charts. - Tracks project status, communicates it upward. - May also do some communicating expectations downward. - Translates blunt assessments of the project's progress into managerese. - May have some responsibility for keeping development processes going, especially ones that involve lots of communication (think: Agile shit, or just project status meetings generally) - Helps unblock process-related shit. Product manager: - Writes to Jira a lot. - Does market research, or works closely with those who do. - Guides the direction of the product (e.g. which feature do we tackle next, do we pivot). - Works closely with key stakeholders (clients, product owners, domain experts) to determine that direction. - Sells that direction to management and such. - May have some significant sway on final decisions for e.g. design. - May do quite a bit of business-model analysis.