Brazilian Samba

Samba schools in Brazil are basically social and cultural groups that meet at regular intervals to learn and perform Brazilian samba dance, music and carnival costumes. 'School' originated from the time when the early sambistas used to run through near a teachers college.
 
They practice and often perform in huge square-compounds devoted to practicing and exhibiting samba, an African-Brazilian dance. The Samba schools are traditionally associated with a particular neighborhood and most important of which are rehearsals for the main event which is the yearly carnival.

Brazilian Samba Carnival 2012

Brazil is the most popular samba carnival for the carnival festivals where thousands parade the streets of the Rio de Janeiro dancing to raucous samba rhythms. Samba's interlacing rhythms are made up of many different drums. Each year, the different samba schools will enlarge a unique samba style in a sort of competition. Samba is a rhythmical and energetic Dance, which traces its origin to Brazil and is performed in Samba music in a 2/4 timing. There are three steps in every bar and this makes the samba feel like it is in time. The Samba music rhythm has been danced in Brazil since its inception in the late 19th century. There is actually a set of dances, rather than a single dance, that define the Samba dancing scene in Brazil.

Thus, no one dance can be claimed with assurance as the "original" Samba style. The most important point of the Samba dance besides the Brazilian Samba dancing styles is Ballroom Samba which differs extensively.