<ul><li>BRD, PRD, and FSD are important types of documentation that define the why, what, and how of a product.</li><li>BRD (Business Requirements Document) answers why the product is being built, what business value it brings, and how success will be measured.</li><li>PRD (Product Requirements Document) contains user stories, use cases, and feature definitions, aligning product, design, and engineering.</li><li>FSD (Functional Specifications Document) provides technical, detailed descriptions and diagrams for developers and other technical roles.</li></ul>

BRD vs. PRD vs. FSD: Who Writes What and Why It Even Matters

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