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Functional styles (FSs) are the subsystems of language, each having its specific features (phonetic, lexical and grammatical), determined by the condition of communication in various spheres of human activity.

FSs should be distinguished from the varieties of language. The written and the oral varieties of language are merely forms of communication which depend on the situation in which the communication is maintained (i.e. on the presence or absence of the interlocutor), whereas FSs are patterns of the written variety aimed at securing a desired purpose of communication.