Perl is a well-known programming language and among its main pros is the fact that it supports the so-called modules - short pieces of code that contain subroutines and execute a variety of tasks. The useful side of working with modules is the fact that you do not have to write custom-made program code or add the whole code for a specific task every time it has to be performed. Instead, you can include just a single line in your Perl script that calls a certain module, that consequently will perform the necessary action. Not only will this give you shorter and enhanced scripts, but it will enable you to make changes faster and much easier. In case you are not a programmer, but you'd like to use a Perl app which you've found on the web, for instance, it is likely that the application will require certain modules to be already set up on your web hosting server.