This textbook explores the fundamental shift from traditional to digital business models, focusing on how value is created and captured in the 21st-century economy. While traditional models rely on direct sales, digital enterprises often utilize complex mechanisms such as multisided platforms, freemium services, and the sharing economy (e.g., Airbnb, Google, and Amazon). The authors provide a comprehensive framework for understanding digital transformation, emphasizing that it requires a total reassessment of value chains rather than mere technological integration. Key topics include customer acquisition tactics, the development of business ecosystems, and the evaluation of various digital types, including subscription-based models and social media. Supported by academic theory and practical tools, the book features industrial case studies to guide managers in formulating and implementing successful digital strategies.