Hyperledger Composer is a development toolset that makes it easier to build blockchain applications by allowing users to model business networks and integrate existing systems and data. It supports the Hyperledger Fabric blockchain infrastructure and runtime. The presentation introduces Hyperledger Composer, explains the relationship between Composer and Fabric, demonstrates how to develop a business network by modeling languages, access control, and transactions, and how to generate front-end and REST API applications and deploy networks locally or on IBM Bluemix.