What type of document is not typically used for internal communication?

Business letters are generally formal communications intended for external correspondence, such as correspondence with clients, vendors, or other stakeholders outside the organization. While they can sometimes be used internally, their primary function is to facilitate communication with individuals or entities outside the company, making them less common for internal communication purposes.

In contrast, memos, emails, and reports are typically employed for internal communication. Memos are brief, focused messages used to convey important information within an organization, while emails offer a versatile and widely-used method for quick communication among team members or departments. Reports help summarize, analyze, or present data specifically for internal audiences, such as management or department heads.

Thus, business letters stand apart as the option least associated with typical internal communication practices.