Answer:
Memo
Step-by-step explanation:
A memo or memorandum is a written communication available for use by officials in an organization. It is among the most used modes of written communication in organizations. A memo's main purpose is to communicate instructions, serve as a reminder, or pass on some new information.
A memo is an internal mass communication tool. An official in the organization can use it to pass a message to a large number of people within the organization.