Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A product requirements document (PRD) is a document written by a company that defines a product they are making. A PRD is often created after a marketing requirements document (MRD) has been written and been given approval by management, and is usually written before (or at least concurrently with) a technical requirements document. It is designed to allow people within a company to understand what a product should do and how it should work. PRDs are most frequently written for software products, but can be used for any type of product.

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