Born in the Bahia region of Brazil with strong West African roots, the Samba is an icon of Brazil. To any Brazilian it is the solo dance that you can see danced by the thousands at Carnival. The International Ballroom version of samba is a lively, rhythmical partner dance that differs from Latin dances in that it progresses around the floor with various combinations of timings and beat values as well as a variety of partner positions. The basic movements are counted 1-2 or 1-a-2 with a bouncing action created by a bending of the knees on beats 1 and 2 and a straightening on the ‘a.’

More information:
https://en.wikipedia.org/wiki/Samba_(ballroom)