The document discusses different forms of business communication, including memos, emails, and instant messaging. It provides guidance on how and when to use each method appropriately. Memos are best for internal communication that needs documentation when not all employees have access to email. Email is now very common but can be informal so the document provides tips for writing effective business emails. Instant messaging is growing in use but also has challenges like security and distraction that the document addresses. The document outlines best practices for each communication method.