Perl is a widely used scripting language which is considered to be one of the most practical languages on the Internet. It is feature-rich and it is used to set up multiple web-based applications and CGI scripts. What differentiates Perl from most of the other languages on the web is the compatibility with modules - sets of commands for a particular job that can be integrated into a script by calling them which means that you can write a single line within your script to get a whole module executed, rather than having the entire program code that's already a part of the module anyway. Since Perl supports numerous other programming languages and it comes with a lot of options based on what a particular app can do, it is employed by a number of renowned companies - the BBC, Craigslist, The Internet Movie Database (IMDB), cPanel, etcetera.