Perl is a popular scripting language which is which is used to make various web-oriented applications, which includes CGI scripts. One of the options which distinguish it from other programming languages is the use of modules - parts of Perl code which do predefined tasks and they are commonly accepted. In simple terms, instead of writing tailor-made program code to perform something or pasting tens and hundreds of lines of code in the script, you'll be able to "call" some module which already exists for this specific job and use just a few lines of program code. Due to this fact, your script shall be executed quicker since it is much smaller. Using modules will additionally make the script easier to change because you will have to search through a smaller amount of code. If you wish to use Perl on your website, you should make sure that the necessary modules can be found on your server.