A linguistic norm (literary norm) is the rules for the use of speech means in a certain period of the development of the literary language, i.e. rules of pronunciation, word use, use of traditionally established grammatical, stylistic and other linguistic means adopted in social and linguistic practice. This is a uniform, exemplary, generally recognized use of language elements (words, phrases, sentences). Linguistic norms are a historical phenomenon. Changes in literary norms are due to the constant development of the language. What was the norm in the last century and even 15-20 years ago today can become a deviation from it. The norms help the literary language to maintain its integrity and comprehensibility. They protect the literary language from the flow of dialectal speech, social and professional jargon, and vernacular. This allows the literary language to fulfill its main function - cultural.