What is a product requirements document (PRD)?
A Product Requirements Document (PRD) is a detailed specification that defines what a product or feature should do. It includes the problem statement, user stories with acceptance criteria, technical considerations, success metrics, and edge cases. Popular PRD formats include Marty Cagan's empowered approach (Inspired/Empowered), Lenny Rachitsky's practical template, and Kevin Yien's minimal format from Stripe and Square.