Prd document refers to product requirement document, while product requirement document describes business requirement document and market requirement document in more professional language. The main users of prd include developers, testers, project managers, interaction designers, operators and other business personnel.

This document is the most important document for the product project from the "conceptualization" stage to the "drawing" stage. Of course, this definition is for a brand-new product.

Broadly speaking, the description of product requirements should include product strategy and tactics. Strategy refers to product positioning, target market, target users, competitors and so on. Tactics refers to product structure, core business process, specific use case description, function & etc. Content description, etc.

The product requirements document describes the business requirements document (BRD) and the market requirements document (MRD) in a more professional language.