The Corruption Perceptions Index (CPI) is an annual ranking published by Transparency International that measures the perceived levels of public sector corruption in countries around the world. It uses a scale from 0 to 100, where 0 indicates a high level of corruption and 100 signifies a very clean, corruption-free environment. The index is based on expert assessments and opinion surveys. The CPI aims to raise awareness about corruption and its impact on society, governance, and economic development. By providing a clear picture of corruption perceptions, the index encourages governments and organizations to take action against corrupt practices and promote transparency and accountability.