Language and communication are fundamental aspects of human culture. This unit explores how language systems enable complex idea sharing and how communication encompasses both verbal and non-verbal methods. It delves into language acquisition, linguistic relativity, and the various functions language serves in society. The unit also examines language diversity, structure, and evolution. It covers the origins of human language, the thousands of languages spoken worldwide, and how languages are classified into families. Non-verbal communication across cultures and sociolinguistics are also key topics.