Art Nouveau was an international design movement that originated in Europe in the late 19th century. It emphasized organic, flowing forms inspired by nature and incorporated influences from Japanese art. Major figures included Gustav Klimt, Hector Guimard, Antonio Gaudi, and Charles Rennie Mackintosh. Their works featured curving lines, nature motifs, and innovative use of new materials like glass and iron. Art Nouveau influenced architecture, interior design, graphics and more throughout Europe during the turn of the century period.