Art Nouveau (French pronunciation: [aʁ nuvo], anglicised to /ˈɑrt nuːˈvou/) is an international movement^[2] and style of art, architecture and applied art—especially the decorative arts—that peaked in popularity at the turn of the 20th century (1890–1905).^[3] The name 'Art nouveau' is French for 'new art', it is also known as Jugendstil, German for 'youth style', named after the magazine Jugend, which promoted it, and in Italy, Stile Liberty from the department store in London, Liberty & Co., which popularized the style. A reaction to academic art of the 19th century, it is characterized by organic, especially floral and other plant-inspired motifs, as well as highly-stylized, flowing curvilinear forms.^[4] Art Nouveau is an approach to design according to which artists should work on everything from architecture to furniture, making art part of everyday life.^[5]

Art Nouveau's fifteen-year peak was most strongly felt throughout Europe—from Glasgow to Moscow to Spain—but its influence was global. Hence, it is known in various guises with frequent localized tendencies.^[6] In France, Hector Guimard's metro entrances shaped the landscape of Paris and Emile Gallé was at the center of the school of thought in Nancy. Victor Horta had a decisive impact on architecture in Belgium.^[7] Magazines like Jugend helped spread the style in Germany, especially as a graphic artform, while the Vienna Secessionists influenced art and architecture throughout Austria-Hungary. Art Nouveau was also a movement of distinct individuals such as Gustav Klimt, Charles Rennie Mackintosh, Alfons Mucha, René Lalique, Antoni Gaudí and Louis Comfort Tiffany, each of whom interpreted it in their own individual manner.^[8][9]

Although Art Nouveau fell out of favor with the arrival of 20th-century modernist styles,^[10] it is seen today as an important bridge between the historicism of Neoclassicism and modernism.^[9] Furthermore, Art Nouveau monuments are now recognized by UNESCO on their World Heritage List as significant contributions to cultural heritage.^[11] The historic center of Riga, Latvia, with "the finest collection of art nouveau buildings in Europe", was inscribed on the list in 1997 in part because of the "quality and the quantity of its Art Nouveau/Jugendstil architecture",^[12] and four Brussels town houses by Victor Horta were included in 2000 as "works of human creative genius" that are "outstanding examples of Art Nouveau architecture brilliantly illustrating the transition from the 19th to the 20th century in art, thought, and society."^[1] It later influenced psychedelic art that flourished in the 1960s and 1970s^{[citation needed]}.