Traditionally, corruption refers to moral impurity, but the concept of corruption has changed over time and varies across cultures and different jurisdictions working with varying legislation. ‘What is corruption?’ explains that a significant problem in combating corruption is that analysts cannot agree on what it is. The world’s leading anti-corruption international non-governmental organization, Transparency International (TI), has used two definitions in recent years: ‘the abuse of public office for private gain’ and ‘the abuse of entrusted power for private gain’. But ‘public office’ and ‘private gain’ can be defined in different ways. There are numerous classifications of corruption used by analysts, but for most situations, the narrow definition used by TI and the World Bank is adequate.