Difference between R MarkDown and R NoteBook

Question

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 figu

Answer 1

http://rmarkdown.rstudio.com/r_notebooks.html#notebook_file

"Ordinary R Markdown documents are “knit”, but notebooks are “previewed”. While the notebook preview looks similar to a rendered R Markdown document, the notebook preview does not execute any of your R code chunks"