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Public opinion is the aggregate of individual attitudes or beliefs. Public opinion can also be defined as the complex collection of opinions of many different people and the sum of all their views, or as a single opinion held by an individual about a social or political topic. The meaning of public opinion has changed dramatically over time. Political scientist Susan Herbst writes that "Formalized tabulation of political opinions began in the city-states of ancient Greece, where elections were viewed as central components of the democratic process. Yet it was not until the eighteenth and nineteenth centuries that quantification became a significant element of political discourse in the West."
The English term "public opinion" dates back to the seventeenth century and has derived from the French l’opinion, which was first used in 1588 by Montaigne. This concept came about through the process of urbanization and other political and social forces. For the first time, it became important what people thought, as forms of political contention changed.
The emergence of public opinion as a significant force in the political realm can be dated to the late 17th century. However, opinion had been regarded as having singular importance since far earlier - William Shakespeare had called public opinion the 'mistress of success' and Blaise Pascal thought it was 'the queen of the world.' John Locke in his influential treatise An Essay Concerning Human Understanding considered that man was subject to three laws: the divine law, the civil law, and most importantly in Locke's judgement, the law of opinion or reputation. He regarded the latter as of the highest importance because dislike and ill-opinion force people to conform in their behaviour to social norms, however he didn't consider public opinion as a suitable influence for governments.
William Temple in his essay of 1672, On the Original and Nature of Government gave an early formulation of the importance of public opinion. He observed that:
- when vast numbers of men submit their lives and fortunes absolutely to the will of one, it should be want of heart, but must be force of custom, or opinion, the true ground and foundation of all government, and that which subjects power to authority. Authority rises from the opinion of wisdom, goodness, and valour in the persons who possess it.
The prerequisites for the emergence of a public sphere were increasing levels of literacy which was spurred on by the Reformation, which encouraged individuals to read the Bible in the vernacular, and the rapidly expanding printing presses. During the 18th century religious literature was replaced with secular literature, novels and pamphlets. In parallel to this was the growth in reading societies and clubs. At the turn of the century the first circulating library opened in London and the public library became widespread and available to the public. Another institution of central importance was the coffee-house, which became widespread throughout Europe in the mid-17th century. Although Charles II later tried to suppress the London coffeehouses as "places where the disaffected met, and spread scandalous reports concerning the conduct of His Majesty and his Ministers", the public flocked to them. For several decades following the Restoration, the Wits gathered round John Dryden at Will's Coffee House, in Russell Street, Covent Garden. The coffee houses were great social levellers, open to all men and indifferent to social status, and as a result associated with equality and republicanism. More generally, coffee houses became meeting places where business could be carried on, news exchanged and the London Gazette (government announcements) read. Lloyd's of London had its origins in a coffeehouse run by Edward Lloyd, where underwriters of ship insurance met to do business. By 1739, there were 551 coffeehouses in London; each attracted a particular clientele divided by occupation or attitude, such as Tories and Whigs, wits and stockjobbers, merchants and lawyers, booksellers and authors, men of fashion or the "cits" of the old city center. Joseph Addison wanted to have it said of him that he had "brought philosophy out of closets and libraries to dwell in clubs and assemblies, at tea tables and in coffee houses." According to one French visitor, Antoine François Prévost, coffeehouses, "where you have the right to read all the papers for and against the government," were the "seats of English liberty."
These social changes, in which a closed and largely illiterate public became an open and politicized one, was to become of tremendous political importance in the 19th century as the mass media was circulated ever more widely and literacy was steadily improved. Governments increasingly recognized the importance of managing and directing public opinion. This trend is exemplified in the career of George Canning who restyled his political career from its aristocratic origins to one of popular consent when he contested and won the parliamentary seat in Liverpool; a city with a growing and affluent middle class, which he attributed to the growing influence of "public opinion."
Jeremy Bentham was an impassioned advocate of the importance of public opinion in the shaping of constitutional governance. He thought it important that all official acts should be made public in order for the enlightened public opinion to pass judgment on them: “To the pernicious exercise of the power of government it is the only check.” He opined that public opinion had the power to ensure that rulers would rule for the greatest happiness of the greater number. He brought in Utilitarian philosophy in order to define theories of public opinion.
Concepts of public opinion 
The German sociologist Ferdinand Tönnies, by using the conceptional tools of his theory of Gemeinschaft and Gesellschaft, argued (1922, "Kritik der öffentlichen Meinung"), that 'public opinion' has the equivalent social function in societies (Gesellschaften) which religion has in communities (Gemeinschaften).
German social theorist Jürgen Habermas contributed the idea of "Public sphere" to the discussion of public opinion. The Public Sphere, or bourgeois public, is according to Habermas, where "something approaching public opinion can be formed" (2004, p. 351). Habermas claimed that the Public Sphere featured universal access, rational debate, and disregard for rank. However, he believes that these three features for how public opinion are best formed are no longer in place in western liberal democratic countries. Public opinion, in western democracy, is highly susceptible to elite manipulation.
The American sociologist Herbert Blumer has proposed an altogether different conception of the "public." According to Blumer, public opinion is discussed as a form of collective behavior (another specialized term) which is made up of those who are discussing a given public issue at any one time. Given this definition, there are many publics; each of them comes into being when an issue arises and ceases to exist when the issue is resolved. Blumer claims that people participate in public in different capacities and to different degrees. So, public opinion polling cannot measure the public. An educated individual's participation is more important than that of a drunk. The "mass," in which people independently make decisions about, for example, which brand of toothpaste to buy, is a form of collective behavior different from the public.
Public opinion plays an important role in the political sphere. Cutting across all aspects of relationship between government and public opinion are studies of voting behavior. These have registered the distribution of opinions on a wide variety of issues, have explored the impact of special interest groups on election outcomes and have contributed to our knowledge about the effects of government propaganda and policy.
Contemporary, quantitative approaches to the study of public opinion may be divided into 4 categories:
- quantitative measurement of opinion distributions;
- investigation of the internal relationships among the individual opinions that make up public opinion on an issue;
- description or analysis of the public role of public opinion;
- study both of the communication media that disseminate the ideas on which opinions are based and of the uses that propagandists and other manipulators make of these media.
The rapid spread of public opinion measurement around the world is reflection of the number of uses to which it can be put. Public opinion can be accurately obtained through survey sampling. Both private firms and governments use surveys to inform public policies and public relations. See opinion poll.
Formation of public opinion 
Numerous theories and substantial evidence exists to explain the formation and dynamics of individuals' opinions. Much of this research draws on psychological research on attitudes. In communications studies and political science, mass media are often seen as influential forces on public opinion. Additionally, political socialization and behavioral genetics sometimes explain public opinion.
Mass media effects on public opinion 
The formation of public opinion starts with agenda setting by major media outlets throughout the world. This agenda setting dictates what is newsworthy and how and when it will be reported. The media agenda is set by a variety of different environmental and newswork factors that determines which stories will be newsworthy.
Another key component in the formation of public opinion is framing. Framing is when a story or piece of news is portrayed in a particular way and is meant to sway the consumers attitude one way or the other. Most political issues are heavily framed in order to persuade voters to vote for a particular candidate. For example, if Candidate X once voted on a bill that raised income taxes on the middle class, a framing headline would read "Candidate X Doesn't Care About the Middle Class". This puts Candidate X in a negative frame to the news reader.
Social desirability is another key component to the formation of public opinion. Social desirability is the idea that people in general will form their opinions based on what they believe is the popular opinion. Based on media agenda setting and media framing, most often a particular opinion gets repeated throughout various news mediums and social networking sites, until it creates a false vision where the perceived truth is actually very far away from the actual truth.
Public opinion can be influenced by public relations and the political media. Additionally, mass media utilizes a wide variety of advertising techniques to get their message out and change the minds of people. Since the 1950s, television has been the main medium for molding public opinion.
Relationship between opinion and public policy 
The most pervasive issue dividing theories of the opinion-policy relation bears a striking resemblance to the problem of monism-pluralism in the history of philosophy. The controversy deals with the question of whether the structure of socio-political action should be viewed as a more or less centralized process of acts and decisions by a class of key leaders, representing integrated hierarchies of influence in society or whether it is more accurately envisaged as several sets of relatively autonomous opinion and influence groups, interacting with representative decision makers in an official structure of differentiated governmental authority. The former assumption interprets individual, group and official action as part of a single system and reduces politics and governmental policies to a derivative of three basic analytical terms: society, culture and personality. Public opinion enables the organisation to expand internally and externally through public introspection.
See also 
- American Association for Public Opinion Research
- European Society for Opinion and Marketing Research
- World Association for Public Opinion Research
- Gabriel Tarde
- Ferdinand Tönnies
- Walter Lippmann
- Herbst, S. 1993. Numbered Voices. Chicago: University of Chicago Press. p.7
- Wolfgang Donsbach, The International Encyclopedia of Communication. Wiley-Blackwell, 2008
- Prévost, Abbé (1930) Adventures of a man of quality (translation of Séjour en Angleterre, v. 5 of Mémoires et avantures d'un homme de qualité qui s'est retiré du monde) G. Routledge & Sons, London, OCLC 396693
- Stephen M. Lee, "George Canning and Liberal Toryism, 1801-1827" Woodbridge: Boydell & Brewer, 2008
- Rolf Fechner/Lars Clausen/Arno Bammé (eds.): Öffentliche Meinung zwischen neuer Religion und neuer Wissenschaft. Ferdinand Tönnies' „Kritik der öffentlichen Meinung“ in der internationalen Diskussion, in: Tönnies im Gespräch, tom. 3, Munich/Vienna: Profil 2005, ISBN 3-89019-590-3.
- Diggs-Brown, Barbara (2011) Strategic Public Relations: Audience Focused Practice p.48
- Edward L. Bernays, Crystallizing Public Opinion, 1923
- Jürgen Habermas, The Structural Transformation of the Public Sphere, 1989 (Strukturwandel der Öffentlichkeit, Neuwied 1962)
- Jacob Shamir/Michal Shamir, The Anatomy of Public Opinion, Ann Arbor: University of Michigan Press, 2000. 
- Walter Lippmann, Public Opinion, 1922.
- Norman John Powell, Anatomy of Public Opinion, New York, Prentice-Hall, 1951.
- Ferdinand Tönnies, On Public Opinion, 1970 (Kritik der öffentlichen Meinung, 1922, critical edition by Alexander Deichsel, Rolf Fechner, and Rainer Waßner, Berlin/New York: Walter de Gruyter 2003)