This Brazilian dance was first introduced in 1917 but was finally adopted by Brazilian society in 1930 as a ballroom dance. It is sometimes referred to as a Samba-Carioca, a Baion or a Batucado. The difference is mostly in the tempo played since the steps in all three dance are very similar. The style is to bounce steadily and smoothly in 2/4 meter. They say that the Samba was introduced in the United States in 1939 by the late Carmen Miranda.

http://www.iversonsoftware.com/dance/dance-s.html