The 6 Nations competition is a Rugby Union competition. It includes Scotland, England, Ireland, Wales, France and Italy.
If you win all games, you win the "Grand Slam". If you come top of the league, but haven't won all games, then you just win the Championship...the Grand Slam is the biggie. The last time Scotland won it was 1990.
Within this tournament, there are "smaller" cups to be won. For example, there's the Triple Crown trophy. In order to win it, you have to be either England, Scotland, Ireland or Wales AND you have to beat all 3 competitors. Ireland are looking as if they might nab that this time as they have beaten England and Wales and play Scotland next weekend.
There's also the Calcutta Cup...played for between Scotland and England exclusively. England won it last year and because this game was a draw, they retain that cup. They'll probably win it next year as well as Scotland have an atrocious record at playing England at Twickenham - Scotland haven't won at Twickenham since 1983
Alba gu' brath