Perl is a well-known scripting language that's which is used to make various web-oriented applications, such as CGI scripts. Among the attributes which differentiate it from other programming languages is the usage of modules - batches of Perl program code which complete predefined tasks and they are commonly accepted. In simple terms, rather than creating custom program code to do something or pasting tens and hundreds of lines of program code inside your script, you will be able to "call" some module which is already available for this particular job and use only a few lines of program code. Due to this, your script will be executed faster because it will be smaller. Using modules will, in addition make the script easier to change considering that you will have to search through a smaller amount of program code. In case you want to use Perl on your website, you should ensure that the necessary modules are available on the server.