"Yu-Gi-Oh!" is a popular Japanese franchise that began as a manga series created by Kazuki Takahashi. It follows a young boy named Yugi Mutou, who solves an ancient Egyptian puzzle and awakens a spirit within him. This spirit helps Yugi compete in various card battles, where players use powerful cards to summon monsters and cast spells. The main game in "Yu-Gi-Oh!" is a trading card game where players build decks and duel each other. Each card features unique abilities, and strategy is key to winning. The franchise has expanded to include anime, movies, and video games, captivating fans around the world.