Negate

There are 3 types of negating.

The first is to negate an effect. When an effect is negated, it is prevented from ever happening. It is important to know that destroying a card does not negate it. For example if the turn player plays a Normal Spell Card such as Card Destruction, and the opponent responds by activating Dust Tornado to destroy Card Destruction, the effect of Card Destruction will still occur. However if the opponent activates Magic Jammer instead of Dust Tornado, the effect of Card Destruction will be negated and its effect will never occur.

The second is to negate a Summon. Similar to Negating an effect, if the Summon of a monster is negated, it will never actually be Summoned and will not be treated as ever being on the field. Some monsters such as Caius the Shadow Monarch have effects that activate when they are Summoned. If the turn player Tribute Summons Caius the Shadow Monarch and the opponent responds with Trap Hole, Caius the Shadow Monarch will be destroyed but its effect to remove from play 1 card can still be activated. If the opponent had activated Solemn Judgment instead of Trap Hole, the Summon would be negated and Caius the Shadow Monarch would be sent to the grave without its effect resolving. Another example would be Jinzo. Since Jinzo negates all Trap Cards while its on the field, card such as Trap Hole can not be activated in response to its Summon. However since a card such as Solemn Judgment stops Jinzo from ever being properly Summoned, it can be used.

The third is to negate an attack. When an attack is negated, it stops the battle from ever taking place and prevents the attacking monster from declaring another attack that turn.