Explain what a "memo" is.

A memo, short for memorandum, is mainly characterized as a brief written message utilized for internal communication within an organization. Its primary purpose is to convey information, updates, or instructions clearly and concisely to members of a company or team. Memos can cover a wide range of topics, from sharing important announcements and policy changes to providing reminders and facilitating decision-making processes.

This form of communication is particularly valued in professional settings because it allows for quick dissemination of information while maintaining a level of professionalism. Memos typically follow a specific format, which includes the date, subject, recipient, and sender, along with the main body that addresses the necessary details.

The other options represent different forms of communication but do not accurately define a memo. A formal report, for instance, is generally more extensive and detailed, aimed at management rather than being a succinct message. Similarly, while reminder notes for staff meetings could be considered a type of memo, they do not encompass the full scope of what memos can convey. Lastly, emails sent to external clients fall outside the definition of a memo, as they pertain to external rather than internal communication.