Functional styles. The external and internal language style-forming factors. Functional and stylistic differentiation of the language. Functional styles and levels of formality in the communication. The tradition as a factor in the status and in the forming of certain functional styles. General and specific features of the conversational functional style. Literature-art functional style. Sub-styles (poetic, prose, theatrical). Publicistic functional style. General and specific features of the publicistic functional style. Sub-styles: journalistic and monograph-publicistic sub-styles. Administrative functional style. General and specific features of the administrative functional style. Sub-styles: legislative-juristic, socio-political, diplomatic, business and personal sub-style. Scientific functional style. General and specific features of the scientific functional style. Sub-styles: strictly scientific (academic), scientific-scholarly style and scientific-popular sub-style.