Enforcing a Canonical Domain Name. This helps to specify what domain name you want to use for your site and it will redirect the traffic to the right host name.
For example: your have added multiple domain names binding to your website so the website is working on all those domain names but you want all the domains to be redirected to one domain name.
Redirected to: www.itzoz.com
you can do this by using url rewrite canonical domain name.