What is a Product Requirements Document?

What is a Product Requirements Document?

A Product Requirements Document, commonly called a PRD, explains what a product should accomplish and why. It creates a shared reference for the people planning, designing, building, and evaluating the product. The format can vary, but the document should make important requirements understandable and reviewable.

Describe the problem and intended users

Begin with the problem, the target audience, and the desired outcome. A wedding-management PRD might describe organizers coordinating events and tasks, collaborators completing assigned work, and guests responding to invitations.

Explain the current difficulty, such as information scattered across messages and spreadsheets. State what improvement the product is intended to deliver.

Include scope boundaries so readers know which problems the current version will address and which belong to later exploration.

Specify behavior and constraints

For each feature, describe who uses it, what they can do, and the expected result. Include relevant business rules, permissions, dependencies, and unusual situations.

Acceptance criteria turn descriptions into checkable expectations. For example, a guest invited to two events should be able to submit a separate response for each event.

A PRD can also record quality expectations such as accessibility, reliability, or responsiveness. Detailed implementation plans usually belong in linked architecture, database, and API documents.

Keep requirements useful as the product evolves

List open questions and assumptions instead of disguising them as settled decisions. Identify who can resolve them and when they matter.

Review the document before relying on it for implementation, then update it when feedback or discoveries change the requirements. A PRD is useful when it reflects the team’s current understanding and helps answer concrete product questions, rather than merely existing as a formal deliverable.