A product roadmap is a shared source of truth that outlines the vision, direction, priorities, and progress of a product over time. It's a plan of action that aligns the organization around short and long-term goals for the product or project, and how they will be achieved.
PLG is booming because it is a customer-centric approach that delivers value to both customers and companies. As such, it is likely to continue to grow in popularity in the coming years.
A product roadmap is a high level plan that shows the direction of your product or feature set over time.