Perl is a popular programming language and among its main advantages is the fact that it supports the so-called modules - short pieces of program code which include subroutines and execute various tasks. The beneficial side of using modules is the fact that you will not need to write custom program code or add the entire code for a specific task every time it should be performed. Instead, you'll be able to add only one line in your Perl script that calls a certain module, that in turn will perform the necessary action. Not only will this lead to shorter and optimized scripts, but it will enable you to make modifications quicker and easier. If you are not a programmer, yet you would like to use a Perl app which you've discovered on the web, for example, it is very likely that the application will need specific modules to be already installed on the hosting server.