A resignation letter is a formal notice informing an employer of an employee’s decision to leave. It clearly states the intention to resign, the last working day, and may include a brief reason for departure. The letter often expresses appreciation for opportunities, growth, and support received. Additionally, it offers assistance in ensuring a smooth transition. As a professional courtesy, it helps maintain positive relationships and reflects professionalism. Signed by the employee, the resignation letter serves as an official record of departure, ensuring clarity and mutual understanding.