If you decide to transfer a domain name from one registrar company to another, you will have to go through several security procedures. One of them is getting a unique EPP authentication code from the present domain registrar – as long as you are the domain registrant, since the code is sent to the owner's email and nobody else can see it. You will need to provide this code to the new registrar, or else they won’t be able to begin the domain name transfer. The EPP authentication codes are case-sensitive and may contain digits or special symbols such as dots or commas, which can be easily mistyped, so make sure you copy/paste the correct code. As an additional safety measure, the transfer code for a domain name may be changed regularly. Some registrars call this code a domain password, a domain secret or an Auth key as well.