Art Nouveau, originating in the late 19th century, is an ornamental and decorative art style known for its sinuous lines, intricate patterns, and organic forms inspired by natural elements. Artists like Gustav Klimt and Alphonse Mucha embraced flowing curves and asymmetry, merging art with architecture, design, and applied arts. Art Nouveau sought to break from historicism, emphasizing innovation and the synthesis of art and everyday life.