This document provides an overview of key concepts from the chapter "What is Language?" from the textbook An Introduction to Language by Victoria Fromkin, Robert Rodman, and Nina Hyams. It discusses several main topics: the primary functions of language being creative thinking and mapping real-world concepts rather than just communication; the complexity and creativity of human language; Noam Chomsky's view that language is innate rather than learned; differences between human and animal communication systems; and debates around descriptive vs. prescriptive grammar and language variation. Exercises and examples are provided to illustrate linguistic concepts like sound symbolism, iconicity, and debates around language policy.