Basically, your mainboard is your 60 card (or more) deck. The sideboard can contain up to 15 additional cards that you don't actually play in your main deck. After game 1 against an opponent, you can put some cards from your sideboard into your mainboard and vice versa, so you can fare better against match-ups that your deck normally isn't so good against.
For a more detailed explanation and rulings, see here.
November 17, 2013
5:56 p.m.
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megawurmple says... Accepted answer #1
Basically, your mainboard is your 60 card (or more) deck. The sideboard can contain up to 15 additional cards that you don't actually play in your main deck. After game 1 against an opponent, you can put some cards from your sideboard into your mainboard and vice versa, so you can fare better against match-ups that your deck normally isn't so good against.
For a more detailed explanation and rulings, see here.
November 17, 2013 5:56 p.m.