This document discusses how to build a data-driven product roadmap. It recommends defining goals, prioritizing features using brackets like "expected" and "advanced", setting measurable goals, and publishing the roadmap. Roadmaps should be comprehensive and change based on a product's lifecycle stage - for early stage products, the priorities are expected features and engagement, while mature products focus on engagement and advanced features. By using data and prioritization frameworks, roadmaps can align a product's strategy, features, and goals.