What document does an employee submit to inform their employer of their resignation?

An employee submits a resignation letter to formally notify their employer of their intention to leave the job. A resignation letter serves several important purposes: it provides a clear record of the employee’s intent, outlines the last working day (if specified), and expresses gratitude toward the employer and colleagues, which helps maintain professional relationships. This document is a conventional way to communicate the decision to resign and is often appreciated because it allows for a respectful transition in the workplace.

The term "notice" refers to the period an employee informs the employer of their resignation, rather than being the document itself. Therefore, while notice is an integral part of the resignation process, it is not the correct answer as the specific document used is the resignation letter.