Correspondence research is a field that focuses on the analysis of communication patterns and content in various forms of correspondence, such as letters, emails, texts, and social media messages. Researchers in this area examine how individuals express themselves through written communication, the social and cultural contexts that influence these expression, and the impact of different communication styles on relationships and interactions. Correspondence research often utilizes qualitative and quantitative methods to analyze and interpret textual data, and may involve linguistic, psychological, sociological, or historical approaches to studying communication.