Twitter, Instagram, Pinterest. These are more than just products, they are habits—apps we turn to without thinking. How? Why? And what can we learn from them? Using years of research, consulting and practical experience, serial entrepreneur Nir Eyal unlocks consumer psychologies and reveals the 'Hook Model', a four-step process of how to make products that people just can't put down—products that will bring users back repeatedly without costly advertising or aggressive messaging. Hooked is a blueprint and practical plan written for product managers, designers, marketers, startup founders and anyone eager to learn more about the things that control our behavior. It's the how-to guide Eyal wishes had been available to him as a startup founder.