A resignation letter is a formal notice stating your intention to leave your job. It typically includes details like your last day and potential next steps.A resignation letter is a form that gives notice to an entity or organization of an employee's intent to quit their job. Commence your letter with a formal salutation and a concise introductory paragraph. Check your intake paperwork to find this information if you are unsure. There's no reason to draw this letter out beyond a single page. Please accept this letter as a notice of my resignation. The idea is to relay all the important information concerning your resignation while keeping it short and concise.