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DEF
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'''DEF''' (commonly referred to as ''Defense Points'') are the points that determine a monsters '''defense''' or '''toughness''' when defending against your opponent's [[Monster Cards]]. If a Monster attacks another with an [[ATK]] that is greater than or equal to the DEF of that Monster, the [[Defense Position]] monster is [[destroyed]], but the owner of the [[Defense Position]] Monster takes no [[damage]] to his/her [[Life Points]], unless the attacking Monster has an ability (called "[[Piercing]]") where the difference between [[ATK]] and DEF is dealt as [[Battle Damage]].
If the same situation is reversed, where the [[ATK]] is lower than the opponent's monster's DEF, both monsters remain on the field, but the owner of the [[ATK]] monster loses [[Life Points]] equal to the difference between the [[ATK]] and DEF values.
