Perl is a full-featured scripting language for general use. It is often used for system administration and web develpment.
It has a lot of important features and gives the experienced developer a full range of possibilities. The best »feature« of Perl is it's repository of ready to use modules, CPAN.
Perl is fast, reliable and extensible.
Some people claim, that Perl code is hard to read, but in reality this depends on the developer's style.