This document discusses oral communication and breathing. It defines oral communication as communication between two or more people using a shared language through physical transmission, traditionally air. It notes oral communication allows transmitting information, ideas, feelings, and opinions. It also discusses characteristics of oral communication like it being bilateral and context-dependent. The document then covers different types of breathing techniques like diaphragmatic breathing and types of intonation used in English like falling, rising, and fall-rise intonation. It concludes by defining diction as a speaker or writer's choice of words that can impact understandability.