In public relations and communication science, publics are groups of individual people, and the public (a.k.a. the general public) is the totality of such groupings. {{#invoke:Footnotes|sfn}}{{#invoke:Footnotes|sfn}} This is a different concept to the sociological concept of the Öffentlichkeit or public sphere. {{#invoke:Footnotes|sfn}} The concept of a public has also been defined in political science, psychology, marketing, and advertising.