Art Nouveau or Jugendstil is an international philosophy and style of art, architecture and applied art—especially the decorative arts—that was most popular during 1890–1910. English uses the French name Art nouveau ("new art"), but the style has many different names in other countries. A reaction to academic art of the 19th century, it was inspired by natural forms and structures, not only in flowers and plants, but also in curved lines. Architects tried to harmonize with the natural environment.
– Excerpt from Wikipedia