It's been a rocky few weeks for European banks, which have lost nearly one-quarter of their stock market value since the start of the year. Investors are worried about lenders' high debt piles and exposure to the struggling energy sector and to China, amid global market turmoil.
The financial and economic crisis that rocked Europe from 2008 is still fresh in people's minds. Then banks got into serious trouble by overloading their balance sheets with risky private and government debt. As a result, once the economy hit recession, they found it difficult to raise funds and, in some cases, fill their cash machines.
As a result of the crisis, European authorities have strived since then to improve how lenders are supervised and, should they fail, how they are either wound down or rescued.
However, some of the plans are yet to be instituted, and there is fierce debate about how much power member countries should hand over to authorities in Brussels and whether supervision will hamper banks' profitability.
CNBC takes a look at what measures the euro zone has in place to stop banking systems in its 19 member countries going to the wall.