Parked domains are often used by businesses that want to have more than one web address for advertising purposes. Parked domains are additional domains hosted on your account which display the same website as your primary domain and share web statistics as well; however, you can give the parked domain its own email boxes.
For example, if you own domain1.com and it is the primary domain of your cPanel account, you can set up domain2.com as a parked domain and it will load the content of domain1.com. When you visit domain2.com, you will notice that although the content of domain1.com is loading in the browser, the address bar will display http://domain2.com/
I hope this information will be beneficial for you.