The "Magic Cup" is a popular term often used to describe a special type of cup that can change color or reveal hidden designs when filled with a hot or cold beverage. These cups are typically made from heat-sensitive materials that react to temperature changes, making them a fun and interactive way to enjoy drinks. Magic Cups are often used as novelty items or gifts, appealing to both children and adults. They can feature various designs, including characters from cartoons, movies, or video games, adding to their charm and collectibility.