This chapter discusses the nature of language, emphasizing its unique design features that differentiate human communication from animal communication, such as arbitrariness, creativity, duality, and displacement. It explores the origins of language, positing that it developed in East Africa around 100,000 years ago, a process influenced by common perceptions of the world and the ability to produce varied sounds. The chapter also highlights the various functions of language in human life, including social interaction, persuasion, emotional expression, and aesthetic purposes.