This document discusses the concepts of social inclusion and social exclusion. It defines social exclusion as a state in which individuals are unable to fully participate in economic, social, political and cultural life due to lack of access to resources, rights, goods and services. Social inclusion is defined as the process of improving participation for disadvantaged groups through enhancing opportunities, access to resources, voice and rights protection. While measuring social exclusion is challenging due to its multidimensional nature, the document presents data on key aspects of exclusion to illustrate both country progress and remaining data gaps in monitoring social inclusion.