memorandum

right|thumb|Memo written by a White House staff member during the tenure of [[Jimmy Carter as US president]]

A memorandum (: memorandums or memoranda; from the Latin memorandum, "(that) which is to be remembered"), also known as a briefing note, is a written message that is typically used in a professional setting. Commonly abbreviated memo, these messages are usually brief and are designed to be easily and quickly understood. Memos can thus communicate important information efficiently in order to make dynamic and effective changes.