International rugby teams are the pinnacle; the best of the best. They take the best talent from a nation and combine to make the best squad to represent their country at the highest level.
International rugby across the world is split into two broad territories:
6 Nations is the northern hemispheres group: England, Scotland, Ireland, Wales, France & Italy.
Rugby Championship [formerly the Tri-Nations] is the southern hemisphere group: New Zealand All Blacks, Australia, South Africa & Argentina.
Any teams which do not play in either of these International leagues, you'll find in the Other International Teams section.