The document defines and provides examples of interjections. It states that interjections are parts of speech that express strong feelings or emotions and have no grammatical connection to the rest of the sentence. Interjections are used to exclaim, protest or command. Examples like "Oh!", "Wow!", and "Ouch!" are given. The document also notes that interjections are commonly followed by exclamation points and are mostly used in speaking rather than formal writing.