A memorandum, often referred to as a memo, is a written message used for internal communication within an organization. It typically conveys information, requests, or directives and is usually brief and to the point. Memos can be used to inform employees about policy changes, upcoming meetings, or important announcements. Memos are generally formatted with a header that includes the sender's name, recipient's name, date, and subject line. They can be distributed in printed form or electronically, making them a versatile tool for maintaining clear communication within teams and departments.