Language diversity is the study of the different languages spoken worldwide, focusing on the variety of languages, dialects, and linguistic features found within and across different regions and cultures. Researchers in this field explore how languages develop, evolve, and interact with each other, as well as the social, cultural, and historical factors that shape linguistic diversity. This area of research can have implications for language preservation, education, and communication, and can help us better understand the unique ways in which people communicate and express themselves through language.