An "Alter Ego" refers to a second self or a different version of a person, often used to express hidden traits or desires. This concept can be found in literature, psychology, and popular culture, where individuals adopt an alternate identity to explore aspects of their personality that they may not express in their everyday lives. In literature, characters like Dr. Jekyll and Mr. Hyde exemplify the idea of an alter ego, showcasing the duality of human nature. In psychology, the term can describe a coping mechanism, allowing individuals to navigate complex emotions or situations by embodying a different persona.