The document introduces the concept of a business model and distinguishes it from a business plan. It defines a business model as describing how an organization creates, delivers, and captures value using nine building blocks: customer segments, value propositions, channels, customer relationships, revenue streams, key resources, key activities, key partnerships, and cost structure. These building blocks cover four main areas of a business: customers, offer, infrastructure, and financial viability. The document then provides a deeper dive into each of the nine business model building blocks and shows an example of how they apply to Skype's "freemium" business model.