If you decide to transfer a domain name from one registrar to another, you will need to pass through a few security procedures. One of them is obtaining a unique EPP authorization code from the present registrar company – on the condition that you are the registrant, since the code is sent to the domain owner’s email and nobody else can see it. You need to give this code to the new registrar, or else they won’t be able to start the domain transfer process. The EPP codes are case-sensitive and may comprise of digits or special symbols such as commas or dots, which can be easily miswritten, so make sure you copy/paste the correct code. As an additional security measure, the transfer authorization code for a domain name may be changed regularly. Some companies call this code a domain secret, an Auth key or a domain password as well.