What are the main differences between Art Deco and Art Nouveau?

Answer 1

They are two different art styles, with Art Deco evolving partially from Art Nouveau. Here is a good website comparing the two:

For Art Nouveau, think of the posters of Mucha, Women in flowing robes and floral ornaments. For Art Deco, think Bauhaus, it's less ornate than Art Nouveau and more simplistic.

"The Art Nouveau style appeared in the early 1880s and was gone by the eve of the First World War."

"Art Deco was a popular design movement from 1920 until 1939, affecting the decorative arts such as architecture, interior design, and industrial design, as well as the visual arts such as fashion, painting, the graphic arts, and film. This movement was, in a sense, an amalgam of many different styles and movements of the early 20th century, including Constructivism, Cubism, Modernism, Bauhaus, Art Nouveau, and Futurism."