A memorandum, often shortened to "memo," is a form of written communication specifically intended for use within an organization. Memos are the primary tool for internal correspondence between colleagues and departments.

Common Uses for Memos:

• Announcing personnel transfers, meetings, or policy changes.
• Distributing reports within the company (e.g., progress reports, justification reports).
• Making requests or providing information to colleagues.

Because they are internal, memos typically have a more informal tone than letters and use a standardized format (To, From, Date, Subject).

While not explicitly detailed as a separate document type in the provided questions, email functions as the modern equivalent of the memo for most internal communication and has also become a standard for much external communication. The principles of clarity, conciseness, and courtesy apply just as strongly to emails. The choice between a formal email and a more casual one depends on the audience and purpose.

A letter is a type of message written for an audience outside the organization. It is the standard format for formal and informal communication with clients, suppliers, government agencies, and other external parties. A letter report, for instance, is an informal report presented in a letter format for external distribution.

The Essential Parts of a Business Letter

A professional business letter requires several essential parts to be complete.

• Letterhead/Heading: Includes the sender's name and address. If not on pre-printed letterhead, it is typed at the top of the page.
• Date: The date the letter is written, placed below the heading.
• Inside Address: The recipient's full name, title, and address.
• Salutation: The opening greeting, such as "Dear Mr. Aslam,". The salutation is written above the body of the letter and typically two lines below the inside address.
• Body: The main part of the letter containing the message, organized into paragraphs.
• Complimentary Close: The closing phrase, such as "Sincerely," or "Yours truly,".
• Signature: The handwritten signature of the sender, placed below the complimentary close, followed by the sender's typed name.

Optional Parts of a Business Letter

Some parts are not required but can be added for specific purposes.

• Addressee Notation: A notation like "CONFIDENTIAL" or "PERSONAL" is written on a letter to restrict its readership. It is typically placed two lines above the inside address to indicate that the letter should only be read by the intended recipient.
• Copy Notation (cc / bcc): A copy notation indicates who else is receiving a copy of the letter.
  • cc (carbon copy): Used when you want the primary recipient to know who else is receiving a copy.
  • bcc (blind carbon copy): Used when you want to send a copy to someone without the primary recipient's knowledge. The "bcc" notation appears only on the copy, not the original.
• Postscript (P.S.): This is considered a non-essential part, added after the signature only when needed to emphasize a point or add a personal note.