A relieving letter is an official document issued by an employer to an employee upon their departure from the company. It confirms that the employee has resigned and has been relieved of their duties, effective from a specific date. The letter typically includes the employee's name, job title, employment duration, and a statement of good conduct. It may also mention that the employee has handed over responsibilities and cleared all dues. Signed by an authorized person, the relieving letter serves as proof of employment and is often required for future job applications or other formal processes.