Explanation:

A job description is a document intended to provide job applicants with an outline of the main duties and responsibilities of the role for which they are applying. The description is usually drawn up by the individual in the organisation responsible for overseeing the selection process for the role, often with the help of the company’s HR department and/or an external recruiter.
A job description is an essential part of the job application process as, with the right information, it should help applicants to determine whether the role is in line with their skill set and whether it is a job they actually want to do. From the organisation’s perspective, the job description is vital in ensuring that the applications received for the position closely match the needs of the role itself.