I am trying to understand at a high level what the differences between `R Markdown` and `R NoteBook`. I know they are interrelated but I would like to figure out how they are related. My understanding is this:

I know R Notebooks are really R Markdown documents but I am confused about the terminologies.

RStudio new file option has both `R Markdown` and `R NoteBook` and selecting either of them opens an `R Markdown` file but with minor differences. **So just trying to figure out why are there two options and what is the difference between the two?** 

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/oyKmv.png

I understand R Notebooks are newly introduced and R Markdown has been there for a while. Part of the confusion could be because I never used `R Markdown` before R Notebook was introduced so my related or more specific question is

**What is R NoteBook doing differently than just using R MarkDown or what new capabilities is R NoteBook bringing?**
 
All my hits on web search are pointing that R Notebook uses R Markdown but I did not find any help on what is specifically different between the two. 


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Difference between R MarkDown and R NoteBook