Authorisation Code
Many domains require an authorisation code for a domain transfer between two registrars (providers).
By providing the authorisation code, the Domain owner (Reg-C) authorises the new registrar to begin the transfer. The authorisation code makes sure that only an authorised person (domain owner) can move the domain. The domain owner can find the respective authorisation code for their domain from their current provider.
Additional Information
If you are having trouble finding your authorisation code, please see the following article: