Perl is a widely used scripting language that is considered to be one of the most practical languages in the online world. It is feature-rich and it's used to generate multiple web-based applications and CGI scripts. What differentiates Perl from most of the other languages on the market is the compatibility with modules - groups of commands for a certain job that can be included in 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 whole program code that's already included in the module anyway. As Perl can be used with various other languages and it comes with a lot of options based on what a given application can do, it's employed by many well-known companies - the BBC, Craigslist, The Internet Movie Database (IMDB), cPanel, etcetera.