A "Streamliner" refers to a design concept primarily used in transportation, characterized by smooth, aerodynamic shapes that reduce air resistance. This design is commonly seen in trains, cars, and airplanes, enhancing speed and fuel efficiency. The term gained popularity in the 1930s, particularly with the introduction of the Streamliner trains in the United States, which featured sleek designs and luxurious interiors. In addition to transportation, the concept of streamlining has influenced various industries, including architecture and product design. By minimizing drag and optimizing performance, streamliners have become synonymous with modernity and innovation, reflecting a commitment to efficiency and aesthetic appeal.