Authorization Key

In relation to web site hosting, what is Authorization Key?

Solution: Authorization Key

Ahh.  I'm guessing that the individual wants to transfer DNS control for the domain name from where it is currently registered to a new registrar account under his name.  To transfer DNS control, many DNS registrars require an authorization code.

...something like this:
http://www.wdbc.com/domain/transfer-authcode.cfm