"Invisible" refers to something that cannot be seen or perceived by the naked eye. This concept can apply to various subjects, such as light waves that are outside the visible spectrum, or gases that are colorless and odorless. In literature and art, invisibility often symbolizes themes of isolation or the unnoticed aspects of life. In popular culture, the idea of being invisible is frequently explored in superhero stories, where characters possess the ability to become unseen. This power can represent both freedom and the potential for misuse, highlighting moral dilemmas. The concept also appears in science fiction, where technology may allow for cloaking or rendering objects invisible.