A formal written notice announcing intention to leave a job. To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude.In this article, we explain how to construct a formal resignation letter as well as provide an example to help you write your own. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Use one of our resignation letter templates. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters.