Chapter 15 explores two forms of business and executive communications that public relations professionals regularly work with when communicating with internal and external publics on behalf of an organization: letters and memos. The first half of Chapter 15 introduces letters as a tool used by organizations to communicate with internal and external publics, and it provides an overview of their structure, format, style and tone. The business letter template provides readers with a user-friendly guide for crafting professional letters. The second half of the chapter introduces the memorandum, also called a memo, as a tool used by organizations to communicate with internal publics. The essential elements of a memo are reviewed, and the memo template provides readers with a user-friendly guide for writing memos. The chapter concludes with two exercises related to letters and memos: an exercise in crafting a professional email and an exercise locating a memo and identifying its core components.