This book explains how to create, customize, and share interactive web-friendly documents with R. It covers a range of topics, including how to create interactive visualizations, dashboards, web pages, and applications straight from R. While the process of generating content is dynamic, most content by itself is still static and does not take full advantage of the web as an interactive medium. The book presents a detailed and modular approach to inject interactivity into an R Markdown document using a number of R packages, such as slidify, poirot, dashifyr, shiny, and rCharts.