The document discusses pragmatics, which is the study of how language is used in context and why people use language in particular ways. It provides examples of how the meaning of the word "ball" changes based on the context and discusses different types of context including physical, epistemic, linguistic, and social context. It also discusses speech acts, direct and indirect speech acts, felicity conditions for different speech acts, and Grice's cooperative principle and maxims of conversation. Finally, it discusses language use in advertising and provides discourse analysis examples.