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In page Magic: The Gathering:

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Cards in Magic: The Gathering have a consistent format, with half of the face of the card showing the card's art, and the other half listing the card's mechanics, often relying on commonly-reused keywords to simplify the card's text.[citation needed] Cards fall into generally two classes: lands and spells.[citation needed] Lands produce mana, or magical energy. Players usually can only play one land card per turn, with most land providing a specific color of mana when they are "tapped", usually by rotating the card 90 degrees to show it has been used that turn. Each land can be tapped for mana only once per turn.[6]