Perl is a very popular scripting language that is employed to build different web-oriented apps, such as CGI scripts. Among the options that differentiate it from alternative languages is the usage of modules - parts of Perl program code which complete predefined jobs and they are universally accepted. Basically, as an alternative to writing tailor-made code to make something or pasting tens and hundreds of lines of code inside your script, you can "call" a module which already exists for this specific process and use only a few lines of program code. Due to this, your script shall be executed more rapidly as it'll be much smaller. Using modules will, in addition make your script much easier to change due to the fact that you'll need to go through a smaller amount of code. In case you would like to use Perl on your website, you need to make sure that the mandatory modules can be found on the server.