Perl is a widespread scripting language which is considered to be one of the most practical languages on the web. It is feature-rich and it's used to generate various web-based applications and CGI scripts. What differentiates Perl from most of the alternative languages out there is its compatibility with modules - sets of commands for a particular job that can be included in a script by simply calling them which means that you'll be able to write a single line within your script to get an entire module executed, instead of having the whole code that's already a part of the module anyway. As Perl is compatible with various other programming languages and it provides a lot of options depending on what a specific app can do, it is used by lots of famous companies - the BBC, Craigslist, The Internet Movie Database (IMDB), cPanel, etcetera.