Brazil, Russia, India, China and South Africa make up what is currently called BRICS, a group of emerging economies which is challenging the Western-dominated order and institutions through its collective power. Its New Development Bank is seen as a rival to the World Bank and IMF. Its political and financial strength looks set to grow, with a soar in applications from other nations to join. Its latest expansion will see the bloc at least double in size in 2024. But what are its aims? And how does it plan to achieve them? BBC correspondent Emir Nader talks to Claire Graham about this growing club of nations and its potential influence around the world.