A memorandum is a short letter which is used for communication within an organization. Its name means a note which assists the memory. It is called a memo for short. It is used by staff in high ranking positions to communicate staff who are of the same level or levels under them.
There are different types of a memo which serve different purposes. A downward memo goes from executives to subordinates to announce decisions. An upward memo is written by subordinates to executives to make requests, respond to questions, and submit a report. Thirdly, a horizontal memo moves among colleagues of the same level.
The use of a memorandum in organizations is very important. It is used for making announcements to staff working in an organization. It is used to call the attention of staff to an existing problem. Also, when a decision is made by executives, information is spread among subordinates using a memorandum.
Every organization that values communication cannot do without a memorandum.