The basic duty of the Central Bank is the issue of money and its sale in one form or another. His actions are decisive for economics whole country. It is he who decides how much money needs to be issued and where they should go.
However, there is a central bank in the world that affects the rest of the world. This is the US Federal Reserve, or simply the Fed. The actions of this bank, whether it is raising the key rate or withdrawing large volumes of dollar liquidity, affect most economies in the world, especially developing ones.