An interactive chart is a chart on which you can hover a point, zoom, play with axis, add a button and so on. It has several advantages. It carries more information using the hovering facility. It allows the reader to go deeper in its
understanding of the data, since he can play with it and try to answer its own question. In R, interactive charts are quite easy to do thanks to several libraries. If you use ggplot2, the ggplotly facility of the plotly library will instantly
turn your static version interactive. For specific type of charts, the HTML widgets are a powerful set of libraries that allow to make almost any type of graphic.
Ggplotly is a function from the plotly library that allows to turn any ggplot2 chart interactive. If you know how to make a ggplot2 chart, you will make it interactive in the next 3 minutes, read the related blog post!