The purpose of a product roadmap in tech development is to outline a strategic vision for a product's future. It serves as a communication tool, aligning stakeholders and teams on key objectives, timelines, and prioritization of features. A roadmap helps teams visualize how product development aligns with overall business goals, fostering collaboration among cross-functional teams like engineering, marketing, and sales. Regular updates ensure adaptability to market changes, and the roadmap supports informed decision-making regarding resource allocation and feature deployment.