Perl is a widespread scripting language that's regarded as one of the most practical languages in the online world. It's feature-rich and it is used to set up a variety of web-based apps and CGI scripts. What distinguishes Perl from most of the other languages on the web is its compatibility with modules - groups of commands for a certain process that can be included in a script by calling them i.e. you're able to write only one line inside your script to have a whole module executed, instead of having the whole program code that's already included in the module anyway. As Perl supports numerous other languages and it provides a lot of options based on what a particular application can do, it is employed by many well-known companies - the BBC, Craigslist, The Internet Movie Database (IMDB), cPanel, etc.