\BeginKnitrBlock{rmdnote}<div class="rmdnote">In **shiny** apps these are often split into `ui.R` (short for user interface) and `server.R` files, naming conventions used by `shiny-server`, a server-side Linux application for serving shiny apps on public-facing websites.
`shiny-server` also serves apps defined by a single `app.R` file in an 'app folder'.
Learn more at: https://github.com/rstudio/shiny-server.</div>\EndKnitrBlock{rmdnote}