Perl is a popular programming language and one of its main pros is the fact that it supports the so-called modules - short pieces of program code which contain subroutines and do a variety of tasks. The useful side of employing modules is the fact that you do not need to write custom-made code or add the entire code for some task every time it needs to be executed. Alternatively, you are able to add only a single line in your Perl script that calls a certain module, which consequently will execute the necessary action. Not only will this give you shorter and more optimized scripts, but it'll also enable you to make modifications swifter and much easier. In case you are not a programmer, yet you would like to start using a Perl application which you've discovered on the web, for instance, it is very likely that the app will require certain modules to be already installed on your hosting server.