This document discusses the concept and functions of language. It defines language as a system of communication consisting of sounds and symbols used by a particular group to communicate verbally or in writing. Language evolved over time to help humans survive and develop, emerging around 50,000-100,000 years ago. The document also examines the nature of language, explaining that it is learned, culture-specific to humans, and functions through a system of symbols. Finally, it outlines six functions of language proposed by Jakobson: referential, emotive, conative, phatic, poetic, and metalingual.