This document provides an overview of different functional styles of language, including: scientific, official, publicist, newspaper, and belles-lettres styles. It discusses the classifications and sub-styles of each, along with their general purposes and characteristic lexical and grammatical features. The scientific style aims to communicate research objectively, while the official style uses standardized language in documents. The publicist style combines logic and emotion to influence opinions. The newspaper style objectively informs readers, and the belles-lettres style enriches communication through creative language.