From the Perl manpage: Perl is a language optimized for scanning arbitrary text files, extracting information from those text files, and printing reports based on that information. It's also a good language for many system management tasks. The language is intended to be practical (easy to use, efficient, complete) rather than beautiful (tiny, elegant, minimal).
Perl Mongers (http://www.pm.org) is an organisation which offers services to local Perl users' groups. These services range from arranging speakers from the Perl community to supplying web space and mailing lists.
Perl Mongers is part of The Perl Foundation (http://www.perl-foundation.org) which is in turn a unit of Yet Another Society (http://www.yetanother.org). Perl Mongers has no legal connection with any of the local user groups.