A file just with R code. You can write code, and you can write comments (they start with #). When you save the file, the code is still there when you open it again – unlike code in the console, which disappears when you close R studio.
“File -> New File -> R Script”.
You can execute each line of code standalone. Put your cursor on the line and click “Run”. Or use the keyboard shortcut (CMD + ENTER for Mac/Linux, CTRL + ENTER on Windows).
To run the entire script – every single line of code – click “Source”.