Counter Trap Cards are a special type of card in the Yu-Gi-Oh! trading card game. They are unique because they can only be activated in response to other card effects, specifically other Trap Cards. This means they can negate or counter the effects of those cards, providing strategic advantages during gameplay. To use a Counter Trap Card, players must have it in their hand and meet any specific activation conditions. These cards often require a certain amount of Life Points to be paid or other criteria to be fulfilled. Their ability to disrupt opponents' strategies makes them valuable tools in competitive play.