Samba School (Portuguese: Escola de Samba) is a dance, march, and drumming (Samba Enredo) club. They are practiced and often performed in huge square complexes ("quadras de samba") and are dedicated to the practice and presentation of samba, Afro-Brazilian dance and drumming style. Although the word "school" is in the name, samba schools do not offer education. Samba schools have a strong community base and are traditionally associated with a particular neighborhood. It is often seen as confirming the cultural validity of the African-Brazilian heritage in contrast to the public education system, and has often evolved in contrast to authoritarian development. The phrase "escola de samba" is popularly held to be derived from the school yard site in the early rehearsals of the first group. In Rio de Janeiro in particular, it is mostly associated with slums ("Favelias"). Samba and samba school can be deeply intertwined with the daily lives of shantytowns. Throughout the year samba schools have various events and events, the most important of which are rehearsals for the main event which is carnival parade annually. Each of the major schools spends several months each year designing the theme, holding a contest for their song, building floats and training. It is supervised by a carnival manager or carnival. Since 2005, about 14 of rio's best samba schools have used a specially designed warehouse complex, the size of 10 football pitches, called Cidade do Samba, to build and house elaborate floats. The procession of each school may consist of about 3,000 or more artists, and preparations, particularly the production of many different costumes, provide work for thousands of the poorest people in Brazilian society. The resulting competition is a major economic and media event, with tens of thousands of live audiences living and being shown live to millions across South America.