The euro is the official currency of the eurozone, which consists of 19 of the 28 EU member states. It is the second-largest reserve currency in the world after the US dollar.
Since 1999, the euro has been used as an accounting currency in global financial markets. Physical euro coins and banknotes entered into circulation in 2002. In 2009, the euro has become immersed in Europe's sovereign debt crisis which forced the eurozone to adopt a raft of reforms to stabilize the currency.
The European Union during the week imposed a 4.3 billion euro fine on Google — that's about 5 billion dollars — for breaching the bloc's competition rules with its Android operating system. Keith Walker spoke with Ryan Heath, political editor at Politico Europe, and started by asking him what is behind this decision?