Describe the purpose and form of memorandums or memos.

Memorandums, or memos, are a form of letter written inside the business. Though in rare cases they may be used to communicate with those outside the business, they are usually exchanged internally by employees as they conduct their work. Despite the wide use of emails, they are still being used and are especially useful for communicating with employees who do not use computers in their work.
Memorandums can be distinguished from other messages primarily by their form. The word memorandum appears at the top in most cases, but some companies prefer other titles. Below this main heading come the specific headings common to all memos: Date, To, From, Subject etc. Since in some companies memos are often addressed to more than one reader, the heading To may be followed by enough space to list a number of names.