Quotation marks are a convention of written language that help clarify writing for both readers and writers by marking quotations, titles, translations, and other words and phrases. There are two types of quotation marks: double quotation marks and single quotation marks. Double quotes enclose direct quotations, indicate titles of minor works or smaller parts of whole works, mark special uses and deliberate misuses of words and phrases, and indicate translations of foreign words. Single quotes enclose direct quotations inside direct quotations and indicate translations of foreign words. This guide to punctuation marks provides information on using double and single quotation marks in written language as well as offers lesson plans for teaching the correct use of quotes in writing.