If you want to transfer a domain from one registrar company to another, you will need a unique domain authorization code, which may be referred to by multiple names – an EPP key, an AuthInfo code, a domain name password, etc. All these names designate the exact same thing – a code that the domain name registrant obtains from the present registrar and provides to the new one upon ordering. Without a valid code, a domain transfer cannot be started and this is one of the security measures against unwanted transfers used with all generic and with most country-specific extensions. For even greater security, the code comprises of digits and/or special characters and is case-sensitive, so in case you would like to transfer one of your domains, you have to supply the new domain name registrar with the correct code.