A Domain Name is your address on the Internet. It is your unique identity on the Internet that corresponds to your numeric address "IP." Or in simple terms, a domain name is the part of your Internet address that comes after "www".
What does .SU stand for?
The two-letter abbreviation, .SU, is a unified standard system agreed upon to identify and reserve domain names specified for the former Soviet Union.
Is the .SU domain extension currently in use?
No. As the Soviet Union has officially disbanded, this domain is being phased out and is currently NOT being registered or used.