The document discusses the SharePoint Framework (SPFx) which is a new development model for building client-side SharePoint solutions using modern web technologies like HTML, CSS and JavaScript. It provides an overview of SPFx including its key features such as being framework agnostic and enabling responsive designs. The document compares SPFx to traditional SharePoint development and the add-in model, highlighting benefits like running solutions in no-script sites. It demonstrates the development tools, build process and deployment options for SPFx client-side web parts.