To tap a creature means to turn it sideways. Tapping a card shows that it has been used for the turn.
You tap cards in your mana zone to cast spells and summon creatures. Creatures tap when they attack, protect or block.
Untapping a creature or mana means to turn it straight. Untapping your creatures is always done at the start of your turn before you draw.
There are some special creatures that untap themselves or other creatures by special abilities, like Nimbus Scout
Game Terms
Game Zones
Characteristics
Card ● Card Abilities ● Card Frame ● Card Name ● Card Rarity
Civilization ● Flavor Text ● Level ● Power ● Race
Civilization ● Flavor Text ● Level ● Power ● Race
Advanced Gameplay