.va is the ccTLD for the State of Vatican City (equivalent to, say, .uk for the United Kingdom)
vatican.va is the domain used by the Holy See as such. Given the relation between the Holy See and the State of Vatican City, this is very loosely parallel to royal.uk ("The Vatican" is a common metonym for the Holy See)
vaticanstate.va is the domain used by the State of Vatican City (this is like gov.uk)
Several subordinate organizations of the Holy See or the State of Vatican City have their own second-level domains under the .va ccTLD.
.va is the ccTLD for the State of Vatican City (equivalent to, say, .uk for the United Kingdom)
vatican.va is the domain used by the Holy See as such. Given the relation between the Holy See and the State of Vatican City, this is very loosely parallel to royal.uk ("The Vatican" is a common metonym for the Holy See)
vaticanstate.va is the domain used by the State of Vatican City (this is like gov.uk)
Several subordinate organizations of the Holy See or the State of Vatican City have their own second-level domains under the .va ccTLD.