An "imposter" is someone who pretends to be someone else or to have qualities that they do not possess. This can occur in various contexts, such as in social situations, workplaces, or online environments. Imposters may deceive others for personal gain, recognition, or to fit in, often leading to feelings of guilt or anxiety. The term is also associated with the psychological phenomenon known as the Impostor Syndrome, where individuals doubt their accomplishments and fear being exposed as a fraud, despite evidence of their competence. This syndrome can affect anyone, regardless of their success or expertise, leading to self-doubt and stress.