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Definition of being 'seeded'
There are three rounds to a tournament; quater finals, semi finals and the final. Four teams enter into the quater finals. The winner of each of these matches plays the 'seeded' team in the semi finals. The winner of this match will go on to play in the final. Thus, there are two teams who have only had to play two matches (semi finals and finals). Find attached a crude diagram illustrating this point.
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This is also called 'Getting a Bye'
which is really useful, unless the tournament you're in is playing for points.
then it really really sucks.