The European Central Bank (ECB) has 3 major branches:
Governing Council – assesses economic and monetary developments, defines eurozone monetary policy and fixes the interest rates at which commercial banks can borrow from the ECB.
Executive Board – implements monetary policy, manages day-to-day operations, prepares Governing Council meetings and exercises powers delegated to it by the Governing Council.
General Council – contributes to advisory and coordination work and helps to prepare for new countries joining the euro.
The primary decision-making body, the Governing Council, is comprised of the Executive Board and the governors of national central banks of Eurozone countries. Presently, monetary policy decisions require a majority consensus within the Governing Council, with each member holding one vote.