This chapter discusses cultural and ethnic identities and the keys to understanding them. It covers: [1] how families and gender socialization influence identity formation; [2] the processes of acculturation and enculturation when joining new cultural groups; and [3] models of cultural, ethnic, and racial identity development and change over time, including types like assimilated, bicultural, and marginal identities. The chapter concludes with exercises to reflect on one's own cultural identity and practice mindful listening and identity validation skills in intercultural interactions.