What differentiates a memo from an email or letter in format and purpose?

• A. Memos are internal, concise, and focused on policy or procedure; they use a header with to/from/date/subject and are less formal than letters and more formal than casual emails.
• B. Memos are external and informal.
• C. Memos require signature line like letters.
• D. Memos have no header.

Answer: (A)

Memos are internal, concise communications that focus on policy or procedure, and they use a header with To, From, Date, and Subject. This format signals a formal, businesslike note meant for an internal audience, not a personal message or an external letter. Because the goal is to inform colleagues about rules, processes, or decisions, the content is direct and action-oriented, aiming to implement or clarify guidelines rather than to build a relationship or request a detailed reply.

The header helps recipients quickly see who wrote it, who it’s for, when it was sent, and what it’s about, which supports efficient internal dissemination. The tone is typically straightforward and uses plain language, with little or no personal salutations or closing statements, which distinguishes it from many letters and from more casual emails. Overall, memos sit between letters and casual emails in formality, and they’re tailored for internal communication of policies or procedures.

The other choices don’t fit because memos are not primarily external or informal; they usually do include a header and routing information; and they don’t inherently require a signature line like letters.