Language variation and change refer to the differences in how languages are used by speakers and how they evolve over time. Study of these variations helps understand how languages adapt to different social, geographical and historical contexts. Variations can occur in pronunciation (accent), vocabulary (word choice), grammar (sentence structure), and discourse (ways of speaking). These differences enrich language diversity and reflect cultural identities. It also helps in preserving linguistic heritage and promoting inclusivity by recognizing different ways of speaking as valid and valuable. With the course of human evolution, the nature of human communication has changed inevitably. Language change is a natural process driven by social interactions and technological advancements, reflecting the dynamic nature of human communication. The book aims to shed light on some of the unexplored aspects of language variation and change. Also included in this book is a detailed explanation of the various concepts and applications of linguistics. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.