Citizenship is a constitutive component of contemporary societies. It has also become a central concept in the social sciences. This chapter examines the concept of citizenship from a specific vantage point: that of participation and, more precisely, of political participation. To do so, it addresses three key questions: What is citizenship? How does participation relate to citizenship? How has participation changed over time? Concerning how it has transformed, five processes of change are discussed: the continuing expansion of political participation, the normalization of protest and of the protesters, the changing scale of participation, its increasing individualization, and its growing digitalization. The chapter closes with some reflections about how these changes are challenging the traditional views and practices of citizenship. The most relevant of them has to do with the process of personalization of political participation.