Perl is an efficient programming language that's frequently used for generating CGI scripts and various web-based applications. One of its major advantages is that it works with modules - ready-made batches of code that are employed to perform a variety of tasks and to increase the functionality of a given script without slowing it with unneeded lines of program code. This means that, when five jobs have to be executed, you're able to use five lines of program code in order to call each of the modules instead of adding a large number of lines used to set up the actual modules within your script. Perl is really useful and it can be used for many different purposes, that's why many corporations have integrated it in their web products or on their resource-demanding sites - cPanel, IMDB, Craigslist, BugZilla, BBC and many more. It is generally used along with other languages for example PHP or Python.