Language plays an important role in culture. This chapter discusses what languages are, how they develop and spread, and how they shape places and identities. It explores how languages form language families over time through sound shifts. The Proto-Indo-European language is used as a case study to show how linguists reconstruct ancestral languages and trace their diffusion. The chapter also examines how multilingualism, dialects, and global languages develop and impact geopolitics. Finally, it analyzes how place names can change due to factors like decolonization, revolution, and commercialization.