This document defines and provides examples of interjections. Interjections are words that express emotions or reactions. They include words that show emotion like "Wow!" and "Ouch!", words used as greetings like "Hello!" and "Hey!", words that show agreement or disagreement like "Sure!" and "No!", and just sounds like "Ugh!" and "Phew!". The document provides examples of interjections used in sentences and discusses punctuation used with interjections.