A Fusion Monster is a type of card in the trading card game Yu-Gi-Oh!. These monsters are created by combining two or more specific monster cards using a special card called a Fusion Spell Card. This process allows players to summon powerful creatures with enhanced abilities and effects, making them valuable in gameplay. To summon a Fusion Monster, players must have the required materials in their hand or on the field. Once summoned, Fusion Monsters often have higher attack and defense points compared to regular monsters, providing strategic advantages during duels.