I suppose that you thinks to archivistics, diplomatics, linguistics, forensic examination.

Applied Linguistics= Computational; Forensic; Acquisition; Neurolinguistics; Psycholinguistics; Development; Assessment; Stylistics

Theoretical Linguistics= Cognitive; Generative; Phonology; Semantics; Pragmatics; Lexical; Syntax; Morphology

Descriptive Linguists= Etymology; historical; sociolinguistics; anthropological; comparative; phonetics

Linguistics is the scientific study of languages and includes many theories to include other branches and disciplines of study such as Psychology, sociology, Anthropology,history,cognitive science etc.) is used to explain a language theory and it can be referred to as applied linguistics.

Fields of study in applied linguistics include socio linguistics,phonetics,historical linguistics,syntax,semantics,stylistics,cognitive linguistics and not limited to, second language acquisition, language testing, language program evaluation, forensic linguistics,& discourse analysis .

Pure linguistics is more theoretical, and applied linguistics is more practical and the testing of the theories.

Applied Linguistics= Computational; Forensic; Acquisition; Neurolinguistics; Psycholinguistics; Development; Assessment; Stylistics

Theoretical Linguistics= Cognitive; Generative; Phonology; Semantics; Pragmatics; Lexical; Syntax; Morphology

Descriptive Linguists= Etymology; historical; sociolinguistics; anthropological; comparative; phonetics

Forensic phonetics is a branch of forensic linguistics that deals with analyzing audio recordings to identify speakers, determine their accents or speech characteristics, and provide expert testimony in legal cases. It focuses on using linguistic principles to help in criminal investigations or legal proceedings by examining speech patterns, voice quality, and other vocal characteristics.