Language use is a research area that examines how language is used in everyday communication, both spoken and written. This includes studying the structure, function, and meaning of language in various contexts, as well as the social and cultural factors that influence language use. Researchers in this area may investigate topics such as language variation, discourse analysis, pragmatics, sociolinguistics, and language acquisition. By studying language use, researchers can gain insights into how communication is shaped by language and how people use language to interact, convey information, and express themselves.