Kage Bunshin is a technique from the popular anime and manga series Naruto. It allows a ninja to create multiple copies of themselves, known as shadow clones. Unlike simple illusions, these clones are physical and can interact with the environment, making them useful for combat and training. The technique requires a significant amount of chakra, the energy source used by ninjas. Each clone can perform tasks independently, sharing experiences and knowledge with the original upon dispelling. This ability enhances a ninja's versatility and effectiveness in battles and missions.