According to:  The American Heritage® Dictionary of the English Language: Fourth Edition.  2000.

public relations

PLURAL NOUN: abbr. PR 1. (used with a sing. verb) The art or science of establishing and promoting a favorable relationship with the public. 2. (used with a pl. verb) The methods and activities employed to establish and promote a favorable relationship with the public. 3. (used with a sing. or pl. verb) The degree of success obtained in achieving a favorable relationship with the public.

AS DEFINED BY RIDDELL AND RIDDELL: Public Relations is the art of positioning your business or endeavour in a favorable light in relation to public perception and the media. A simple goal and an intregal part of marketing your business, Riddell and Riddell has been helping business receive the favorable attention they desire and need for more than two decades.