Perl is a widely used programming language and one of its key pros is the fact that it works with the so-called modules - short bits of code which include subroutines and do various tasks. The beneficial side of working with modules is the fact that you do not need to create custom program code or add the whole code for a specific action whenever it should be performed. Instead, you will be able to include only a single line in your Perl script which calls a certain module, that in turn will perform the needed action. Not only will this result in shorter and optimized scripts, but it will also enable you to make adjustments quicker and easier. If you aren't a programmer, yet you would like to work with a Perl app which you've found online, for instance, it is likely that the application will require certain modules to be already installed on your website hosting server.