What is a bluff catcher and how can it be effectively used in poker strategy?

A bluff catcher is a hand that is not strong enough to bet or raise, but strong enough to call a bet from an opponent who may be bluffing. In Poker strategy, a bluff catcher can be effectively used by carefully observing your opponent's betting patterns and tendencies to determine if they are likely bluffing. By correctly identifying when your opponent is bluffing, you can use a bluff catcher to call their bet and win the hand.