A resignation letter is a formal document submitted by an employee to their employer, notifying them of the decision to leave the organization. It typically includes the employee’s intention to resign, the effective date of resignation, and a brief explanation for leaving, if appropriate. The letter should express gratitude for the opportunities and experiences gained during employment. It is courteous to offer assistance during the transition period, such as training a replacement or handing over responsibilities. A resignation letter helps ensure a professional and smooth departure from the company.