This document discusses different types of punctuation marks used at the end of sentences, including periods, exclamation points, and question marks. It explains that end marks let the reader know when to stop and provide cues about the tone or meaning. The document also contains examples of using each type of end mark correctly based on whether the sentence is a statement, question, command, or expresses excitement. It concludes with a rhyming "punctuation rap" that reviews the basic uses and rules for end marks and several other punctuation marks.