Invisibility refers to the state of being unable to be seen by the naked eye. This concept is often explored in science fiction and fantasy, where characters like Harry Potter use magical cloaks to become invisible. In the real world, invisibility can also relate to certain materials or technologies that bend light, making objects less visible or seemingly disappear. The idea of invisibility raises interesting questions in science and philosophy. For example, scientists study metamaterials that can manipulate light waves, potentially leading to practical applications in stealth technology. Additionally, invisibility can symbolize social issues, such as the feeling of being overlooked or ignored in society.