A retirement letter is an essential document that communicates your decision to retire in a professional and respectful way. It serves to formally notify your employer and sets the tone for concluding your career. Key elements include announcing your retirement, mentioning your final working date, expressing heartfelt appreciation, and offering help to ensure a smooth transition. Thoughtfully written, this letter reflects your gratitude and professionalism, leaving a lasting positive impression as you bid farewell to your workplace and colleagues.