From the webpage:
R Markdown provides an authoring framework for data science. You can use a single R Markdown file to both
- save and execute code
- generate high quality reports that can be shared with an audience
R Markdown documents are fully reproducible and support dozens of static and dynamic output formats. This 1-minute video provides a quick tour of what’s possible with R Markdown:
I started to omit this posting, reasoning that with LaTeX and XML, what other languages for composing documents are really necessary?
I don’t suppose it will hurt to have a third language option for your authoring needs.