A resignation letter is a document that you write when you want to quit or leave a job. It formally states that you are resigning from your position and usually includes the reasons for your departure. Full definition
Employment letter templates include resignation letter templates, letter of recommendation templates and even letter of employment templates. (sampletemplates.org)
Just make sure to follow the guidelines in resignation letter format templates which emphasize that although this section should be brief, you need to include the necessary details while maintaining a positive attitude. (template.net)
A lot of times, poorly written resignation letter sample can cause issues. (template.net)