Sociolinguistics emerged as an important field of language study in the 1960s as researchers began examining the relationship between language and society. Sociolinguistics focuses on how social factors like age, gender, social class, and relationships influence the way people use language in different contexts. Some key aspects of sociolinguistic study include language variation according to dialect, accent, and register; diglossia, where communities use more than one language in different social settings; and bilingualism, the use of two languages.