What are Scotland?

Scotland is a country that is part of the United Kingdom of Great Britain and Northern Ireland. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the southwest. In addition to the mainland, Scotland consists of over 790 islands including the Northern Isles and the Hebrides.

Find more details here: http://en.wikipedia.org/wiki/Scotland

I think you mean *What is Scotland?, are would imply there was more than one.