R you use the
library() function to load a package. Thus, surely a package and a library must be the same thing, right?
Actually no, they are not!
So, what’s the difference between the two? A library is nothing but a folder on your computer in which installed packages are saved. Just like a real library that contains books. It is merely a container. A library on its own is useless. It’s the content, the packages, that gives you the power to do almost anything in
If you are using
R on Windows you’ll likely have two libraries. One system wide library containing all packages that come with
R and a user library that contains all packages you have installed on top of the defaults.
To see which libraries you are using use
##  "C:/Users/neitmant/R-Portable/App/R-Portable/library"
You can use the same function to tell
R that a certain folder on your computer should be considered a library, e.g.
Be aware, though, that this will overwrite your default libraries. To add an additional library on top of the existing ones you need to be explicit.
old_libraries <- .libPaths() .libPaths(c("./library", old_libraries))
With that being said you know why I invetiable have to smile if I see an article about the top five
R libraries for xyz.