Memos are used to communicate information within organizations. They typically include a heading with to/from/subject/date, introduction stating the purpose, main points in concise paragraphs or bullet lists, and a close requesting action. Memos should be clear, direct, and concise to inform the reader efficiently. Well-written memos analyze the audience, state the problem and purpose up front, summarize key points, provide supporting details, and close with a call to action.