Language evolution is the study of how languages develop and change over time. It examines the origins of language, the factors that drive linguistic change, and the similarities and differences between different languages. Researchers in this field use a variety of methods, including comparative linguistics, historical linguistics, and evolutionary biology, to investigate how language has evolved and continues to evolve in human populations. Some key questions in language evolution research include how language first emerged in human societies, why languages diversify and change, and how language is shaped by both biological and cultural factors.