If you would like to transfer a domain from one registrar to another, you will need a special code, which may be referred to by various names – an EPP authorization code, an Auth-Info code, a domain name password, and so on. All these names refer to the same thing – a code that the domain name registrant gets from the current registrar and provides to the new one during the order process. Without a valid code, a transfer procedure cannot be initiated and this is one of the security measures against unapproved transfer attempts used with all generic and with most country-code extensions. For even better security, the code contains digits and/or special characters and is case-sensitive, so if you want to transfer one of your domain names, you need to present the new registrar company with the correct code.
