The document discusses punctuation marks and their uses. It defines punctuation marks as graphic symbols that are not letters or numbers that help make written text clearer and easier to interpret. There are two main types: punctuation marks like commas and periods, and auxiliary signs like slashes and hyphens. The document then describes the common punctuation marks - comma, period, question mark, exclamation point, quotation marks, parentheses, semicolon, colon, brackets, ellipses, and hyphen - and provides examples of how each is used.