This textbook is an introduction to the phenomena and processes of language change and variation in the English language in the past as today. The volume describes how English varies in geographical as well as in occupational/disciplinary settings; the aim is to provide students, who study English as a foreign language in mainstream courses in Italian Universities, the basic notions to better understand to what extent English differs according to the geographical and/or the domainspecific context. The textbook is for students with an intermediate/advanced level of English (B2/C1 level of the CEFR). Practice activities, already tested during lessons, complete each chapter and can be used during classes as well as for individual study.