The term "unnecessary" refers to something that is not needed or essential. It describes items, actions, or information that do not contribute to a purpose or goal. For example, carrying extra luggage on a trip can be considered unnecessary if it does not serve a specific function. "Superfluous" is a synonym for unnecessary, often implying an excess beyond what is required. In writing, superfluous words can clutter sentences and obscure meaning. For instance, using phrases like "in my opinion" can be superfluous when the context already indicates a personal viewpoint.