What does vigilance do?

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What does Vigilance do for creatures? Based on the TCG, I imagine something like allowing creatures to both attack and block, but it seems that Defender already does that.
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What is the point of vigilance MTG?
Vigilance is a keyword ability that enables creatures to attack without tapping. If they survive combat, they'll be available to block the following turn. Good on offense and on defense!Can you tap cards with vigilance?
Vigilance allows a creature to attack without tapping. However, it does not cause the creature to untap. As such, giving a tapped creature vigilance won't untap it. Similarly, removing vigilance from a creature that's already attacking will not tap it.Is vigilance a counter?
The keywords that a keyword counter can be are flying, first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance, as well as any variants of those keywords.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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