Book 'Hooked' by Nir Eyal is an insightful guide that teaches readers how to build habit-forming products. It delves into the psychology of user engagement and explores the mechanisms that make certain products irresistible. The book presents a four-step process known as the Hook Model, which includes Trigger, Action, Variable Reward, and Investment. Eyal draws on extensive research and real-world examples to reveal how successful companies create loyalty and engagement among users. This updated edition also includes new insights and lessons learned since the original publication, making it an essential read for entrepreneurs, product managers, and anyone interested in understanding consumer behavior.