This document discusses 10 common monetization models for digital businesses: direct sales, freemium, ad-based, subscription, affiliate, transactional, channel sales, web sales, retail sales, and free product except services. For each model, it provides 1-2 sentences on the pros and cons as well as examples of companies that utilize each model. The models are defined and their revenue generation approaches are briefly explained. In conclusion, it reviews some key monetization model concepts.