Consultant
  A  consultant  (from  Latin :  consultare  "to discuss") is a  professional  who provides professional or expert advice [1]  in a particular area such as security ( electronic  or  physical ),  management ,  accountancy ,  law ,  human resources ,  marketing  (and public relations ),  finance ,  engineering ,  science  or any of many other specialized fields.   A consultant is usually an expert or a professional in a specific field and has a wide knowledge of the subject matter. [2]  The role of consultant outside the medical sphere (where the term is used specifically for a grade of doctor) can fall under one of two general categories:   Internal consultant  - someone who operates within an organization but is available to be consulted on areas of specialism by other departments or individuals (acting as clients); or  External consultant  - someone who is employed extern...