Perl is a well-liked programming language and among its major advantages is that it supports the so-called modules - short pieces of program code that include subroutines and execute different tasks. The useful side of employing modules is that you do not need to create custom-made program code or add the whole code for a given task whenever it has to be executed. Alternatively, you will be able to add only a single line in your Perl script that calls a given module, that in turn will perform the needed action. Not only will this lead to shorter and more optimized scripts, but it will also help you make changes swifter and easier. If you are not a programmer, still you'd like to use a Perl app which you've discovered online, for instance, it is likely that the application will require specific modules to be already installed on your website hosting server.