When you cancel your subscription, your domain name will be deleted. Once a domain name has been deleted, services associated with it, such as websites and e-mail, will stop working, and the domain name can be registered again by anybody.
How to proceed to cancel your subscription and delete your domain name
What does it cost to to cancel a subscription?
We do not bill the registrar for deleting a domain name, but your registrar may charge a fee for their part of the job.