Perl is a very popular web-oriented computer programming language, that is designed to create CGI scripts and also various applications. It's really useful since you do not need to write the very same code repeatedly in order to have some process executed several times, instead you are able to work with modules. They're pre-defined subroutines or sets of functions that can be called and executed within a script. In other words, you can add only a reference to a particular module inside your program code rather than using the whole module code over and over again. In this way, your script will be shorter, therefore it'll be executed faster, not mentioning that it'll be much simpler to maintain or modify. If you would like to use a third-party ready-made Perl script as an alternative to creating your own, it'll probably need certain modules to be pre-installed on the hosting server.