A resignation letter is a formal document that an employee submits to their employer to officially communicate their decision to leave the organization. It generally states the intention to resign, the proposed last working day, and may include a brief reason for the departure, though this is optional. Often, the letter expresses appreciation for the experiences and opportunities gained while working at the company. It may also convey the employee’s willingness to support the transition process. Signed and dated, the letter serves as a professional and respectful notice, helping maintain positive relations after departure.