"Lean UX" by Jeff Gothelf and Josh Seiden introduces a user experience design approach that aligns closely with Agile development methodologies. The book emphasizes collaboration, rapid iteration, and validated learning, encouraging designers to work closely with cross-functional teams to build products more efficiently and effectively. By integrating Lean principles into the UX process, the authors provide practical techniques for creating user experiences that meet real customer needs. Topics include hypothesis-driven design, creating minimum viable products, and fostering a culture of shared understanding, making it a valuable resource for designers, product managers, and development teams.