Abstract
In a national financial system, any imbalance in the functioning of one or another of its components affects the functioning of all the others. The financial crises have proven, every time, that the financial instability entails important economic and social costs. Therefore, preventing them must be a permanent concern of the relevant authorities in all states of the world. In this framework, the author of this paper aims at reviewing a part of the approaches to the financial stability and highlighting, with arguments, the role of the central banks in ensuring and maintaining the financial stability.