An advertisement for cigarettes by Alphonse Mucha, very much in the Art Nouveau style. From Masterpiece Art
It's easy enough to get Art Nouveau and Art Deco confused, probably owing to the fact that they both start with 'art'. But Art Nouveau and Art Deco are actually two very distinct design movements, with very distinct looks, that appeared around the turn of the 20th century. After perusing this brief disambiguation, you may not be an expert on design history — but you can casually drop these two descriptors into conversations, and your friends are sure to be impressed.