Perl is a preferred scripting language that's used to build various web-oriented apps, such as CGI scripts. One of the characteristics that distinguish it from many other programming languages is the use of modules - batches of Perl code which execute predefined jobs and they're universally accepted. In simple terms, rather than creating custom code to make something or pasting tens and hundreds of lines of program code in the script, you are able to "call" a module that already exists for this particular task and use just a couple of lines of code. Therefore, your script will be executed much more quickly since it'll be much smaller. Employing modules will additionally make the script easier to edit because you will need to browse through much less code. In case you intend to use Perl on your site, you should make sure that the required modules are present on your server.