This is an example of a library. You may see a list of other libraries used on Rosetta Code at Category:Solutions by Library.
a selection of subroutines that people have expressed would be nice to have in the Perl core, but the usage would not really be high enough to warrant the use of a keyword, and the size so small such that being individual extensions would be wasteful.
Consult the relevant CPAN page.
This category currently contains no pages or media.