PRD (Product Requirements Document)

What is a PRD (product requirements document)?

A product requirements document explains the why and the what for new functionality.

It usually covers the problem, who has it, strategic context, key decisions, edge cases, dependencies, success criteria, rollout and what is out of scope. It might be 1 page or 20.

A PRD isn't the same as a short product spec. A spec covers bounded work after the decision is clear. A PRD helps write down a larger decision before the work is settled.

Why it matters for product builders

The out-of-scope section often does the most work. Clear exclusions stop a 2-week build from becoming a quarter.

What changes in AI-first products

A person may ask when a PRD is vague. A coding agent may make a reasonable guess and continue. Clear boundaries and done conditions now matter more than a long narrative.