A resignation letter is a formal document that an employee submits to their employer to officially communicate their decision to leave the organization. This letter typically states the employee’s intention to resign, specifies the last working day according to the notice period, and may briefly mention the reason for leaving, though this is optional. A well-written resignation letter often includes words of appreciation for the opportunities and experiences gained during employment. It may also express the employee’s willingness to help with the transition process to ensure a smooth handover. The letter is signed and acts as a professional courtesy.