Is Tasmania a state or territory in Australia? Also is Victoria a territory or state in Australia?

The answer posted above by Pohnpei is quite complete.
However some part of the answer are open to incorrect interpretation.Pohnpei has
stated:

The
only territories on the continent of Australia are Northern Australia and the Capital
Territory.

This is quite
correct, but It sort of overshadows the fact that Australia has several other external
territories. These are Ashmore and Cartier Islands, Christmas Island, Cocos Islands,
Coral Sea Islands, Heard Island and McDonald Islands, and Norfolk Island. In addition
Australia has also claimed about 6 million square kilometer of territory on
Antarctic.

Also it is worthwhile noting that Australia has
a government similar to the system in USA. The country is governed by a federal
government with six states having independent government under the federal structure.
The territories are the part of the country that are directly administered by the
federal government.