A job description is an internal document that clearly states the essential job requirements, job duties, responsibilities, and skills required to perform a specific role. A more detailed job description will cover how success is measured in the role so it can be used during performance evaluations. They are also known as a job specification, JD, and position description (job PD).
If your company or organization is divided into multiple sections, then a job description should mention which department or other unit that particular position reports to. When creating a job description template, it is important to leave a place for listing the department, usually near the beginning of the document.