Perl is a very popular web-oriented computer programming language, that's designed to make CGI scripts and also various applications. It is very practical because you do not have to generate the very same code again and again in order to get some task executed several times, but you are able to use modules. They're pre-defined subroutines or sets of operations which can be called and executed in a script. In other words, you will be able to add only a reference to a specific module inside your code rather than using the whole module code time and time again. In this way, your script will be shorter, thus it will be executed more rapidly, not mentioning that it will be much easier to maintain and / or modify. In case you'd like to take advantage of some third-party ready-made Perl script rather than creating your own, it'll probably need particular modules to be present on the web hosting server.