Vacancy descriptions are a detailed account; put together by management or the particular department, of the entire duties, responsibilities and qualifications of that particular vacancy you are recruiting for.
Remember that when you are writing your job description, you are also writing in detail about your company and also advertising it. Therefore, it needs to be communicated clearly and concisely because the best and most effective job descriptions give people a sense of what it’s like to be a part of the company.
Personality and culture should either be directly described or be reflected in the structure and wording of the description. You should effectively explain the need for that particular position in your company and the exact duty that particular position will take up.