The document discusses the Business Model Canvas, which is a tool used to describe and innovate business models. It consists of 9 blocks that make up the key aspects of a business model, including customers, offerings, infrastructure, and financial viability. The canvas allows users to visualize and discuss new or existing business models by mapping elements onto it using post-it notes. The document also provides examples of well-known business models like Google, Facebook, LinkedIn, and Twitter to illustrate how the canvas can be applied.