Magic: The Gathering formats are different modes in which the Magic: The Gathering collectible card game can be played.   Each format provides rules for deck construction and gameplay. The tournament formats officially sanctioned by the DCI fall into two categories:
- Constructed formats, in which players may build their deck from all the available cards in the format and construct their deck prior to playing in the tournament.
- Limited formats, which involve a restricted and unknown pool of cards, usually created by opening Magic: The Gathering products. These formats require players to build their decks as part of the tournament, with time allotted for deck building.