A DO letter refers to a Demi-Official (DO) letter, commonly used in government and official communication in India and several other countries. It is a form of letter used for official purposes but written in a more personal or informal style. DO letters are typically used when the sender needs to express a personal interest in a matter or convey urgency, and they often include direct instructions or requests.
Here are key features of a DO letter:
- Purpose: The primary aim is to convey important official messages or decisions in a more personalized or informal manner. It’s often used to expedite responses or actions.
- Tone: While the letter remains professional, it has a less rigid and more personal tone than formal letters. It can reflect personal rapport between the sender and recipient.
- Signature: A DO letter is usually signed by the sender personally, often by higher officials like ministers or secretaries, rather than being sent on their behalf.
- Urgency or Importance: DO letters are often sent when a matter is of particular importance, requires quick attention, or when the sender wants to ensure the recipient’s engagement with the issue.
- Communication Between Peers: Typically used between officers of equal or near-equal ranks, such as between different government departments or ministries.
- Format: Though it can be informal in tone, the format remains structured, with reference numbers and dates as found in formal communications.
In government settings, a DO letter is a strategic tool to ensure important matters receive due attention quickly.

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