The public sphere is an area in social life where individuals can come together to freely discuss and identify societal problems, and through that discussion influence political action. It is "a discursive space in which individuals and groups congregate to discuss matters of mutual interest and, where possible, to reach a common judgment." The public sphere can be seen as "a theater in modern societies in which political participation is enacted through the medium of talk" and "a realm of social life in which public opinion can be formed".

The public sphere mediates between the "private sphere" and the "Sphere of Public Authority", "The private sphere comprised civil society in the narrower sense, that is to say, the realm of commodity exchange and of social labor." Whereas the "Sphere of Public Authority" dealt with the State, or realm of the police, and the ruling class, the public sphere crossed over both these realms and "Through the vehicle of public opinion it put the state in touch with the needs of society." "This area is conceptually distinct from the state: it [is] a site for the production and circulation of discourses that can in principle be critical of the state." The public sphere 'is also distinct from the official economy; it is not an arena of market relations but rather one of discursive relations, a theater for debating and deliberating rather than for buying and selling." These distinctions between "state apparatuses, economic markets, and democratic associations...are essential to democratic theory." The people themselves came to see the public sphere as a regulatory institution against the authority of the state. The study of the public sphere centers on the idea of participatory democracy, and how public opinion becomes political action.