Perl is an excellent programming language that's widely used for generating CGI scripts as well as a number of web-based applications. One of its main advantages is the fact that it works with modules - ready-made batches of code which are employed to execute various tasks and to enhance the effectiveness of a certain script without clogging it with unneeded lines of code. In other words, in the event that five tasks have to be performed, you can employ five lines of program code in order to call each of the modules rather than including hundreds of lines used to create the actual modules inside your script. Perl is very convenient and it can be used for numerous purposes, that's why a number of companies have integrated it in their web products or on their high-traffic sites - cPanel, IMDB, Craigslist, BugZilla, BBC and many more. It's generally used with other programming languages like PHP or Python.