The Lean Startup is a groundbreaking book by Eric Ries that introduces the concept of lean startup methodology. It provides a practical framework for entrepreneurs to build and grow successful businesses by embracing continuous innovation, validated learning, and rapid experimentation. The book offers valuable insights into the challenges faced by startups, the importance of customer feedback, and the need for agility in a rapidly changing business landscape. This book is a must-read for aspiring entrepreneurs and anyone interested in the principles of lean startup methodology.