Memo writing is used to make requests or announcements within a business in a concise format. A memo should be structured with a heading including "To", "From", and "Date" fields followed by a short introduction, the main points or purpose, and a concluding call to action. Memos are typically one page or less and use headings, lists, and a clear structure to communicate the key information in an easy-to-read format. Proper editing is important to ensure the memo effectively conveys the intended message.