This book investigates socio-linguistic interactions in different second language (L2) contexts in an effort to identify the trends that lead to the acquisition of sociolinguistic variations by L2 learners, contributing significantly to L2 research and practice. It addresses sociolinguistic subjects such as multilingualism and its effects, as well as regional and social dialectology in L2. The different chapters explore the overall effect that society – including cultural norms, expectations, and contexts – has on L2 usage. They also consider how language varieties differ between groups separated by certain social variables such as ethnicity, religion, status, gender, level of education, and age, and how these variables categorise individuals into social or socioeconomic classes. The volume brings together careful theoretical and empirical research conducted in different countries, including Catalonia, Finland, Greece, Malta, Malaysia, the Republic of Cyprus, and the United Arab Emirates.