Memorandums are less formal communication documents used within an organization. They typically include headings of "To", "From", and "Subject" along with the date. Memorandums are used to give information, instructions, requests for help, or suggestions. They follow a standard format and layout that includes these headings along with the body of the memorandum. Office circulars and orders are also types of internal documents but circulars are used to disseminate information to all departments while orders contain mandatory directions that must be followed.