Stylistics
Stylistics, a branch of applied linguistics, is the study and interpretation of texts of all types, but particularly literary texts, and spoken language with regard to their linguistic and tonal style, where style is the particular variety of language used by different individuals in different situations and settings. For example, the vernacular, or everyday language, may be used among casual friends, whereas more formal language, with respect to grammar, pronunciation or accent, and lexicon or choice of words, is often used in a cover letter and résumé and while speaking during a job interview.