A Product Requirement Document (PRD) is one of the most important tools in a product manager’s toolkit. It defines what you’re building, why it matters, and how success will be measured. A great PRD starts with the problem—what user pain are you solving?—and connects it to measurable success metrics. Instead of dictating tasks, it empowers collaboration among designers, engineers, and stakeholders. The best PRDs are clear, concise, and living documents that evolve with feedback. They transform ideas into structured plans and align everyone around a shared vision. In agile environments, PRDs don’t have to be lengthy; they just need to communicate intent, scope, and outcomes effectively.