Realism is commonly defined as a concern for fact or reality and rejection of the impractical and visionary. However, the term realism is used, with varying meanings, in several of the liberal arts; particularly painting, literature, and philosophy. It is also used in international relations.

In the visual arts and literature, realism is a mid-19th century movement, which started in France. The realists sought to render everyday characters, situations, dilemmas, and events; all in an "accurate" (or realistic) manner. Realism began as a reaction to romanticism, in which subjects were treated idealistically. Realists tended to discard theatrical drama and classical forms of art to depict commonplace or 'realistic' themes.

Realism in visual arts

See also: Gustave Courbet, Edouard Manet, Winslow Homer, Barbizon school, fantastic realism, art film.

Realism in philosophy

Main article: philosophical realism

Realism in philosophical thinking is the belief that properties, usually called Universals, exist independently of the things that manifest them. Thus a realist would hold that even if one were to destroy all of the manifestations of the color red the universal red would still exist. Competing views contrasted with realism, such as nominalism, hold that universals do not "exist" at all; they are no more than words used strictly to describe specific objects, and do not name separately existing things.

In another sense, realism is contrasted with both idealism and materialism, and considered synonymous with weak dualism. In still a third and very contemporary sense, realism is contrasted with anti-realism.

Both these disputes are often carried out relative to some specific area: one might, for example, be a realist about physical matter but an anti-realist about ethics.

Increasingly these last disputes, too, are rejected as misleading, and some philosophers prefer to call the kind of realism espoused there, "metaphyiscal realism," and eschew the whole debate in favour of simple "naturalism" or "natural realism", which is not so much a theory as the position that these debates are "ill-conceived" if not "incoherent," and that there is no more to deciding what is really real than simply taking our words at face value.

See also: legal realism, critical realism, scientific realism, naïve realism, socialist realism, philosophical skepticism, technorealism

Realism in social science

Closely linked to realism in philosophy, is realism in research. Realist researchers believe that since they are attempting to describe the real world they have to be cautious about how they do so. Typically realists use qualitative research methods. In this sense, realism is opposed to positivism, which tends towards quantitative method.

Realism in international relations

See international relations.

The term "realism" comes from the German compound word "realpolitik", from the words "real" (meaning "realistic", "practical", or "actual") and "politik" (meaning "politics"). It is the balance of power among nation-states. Bismarck coined the term after following Metternich's lead in finding ways to balance the power of European empires. Balancing power meant keeping the peace, and careful realpolitik practioners tried to avoid arms races. However, during the early-20th Century, arms races (and alliances) occurred anyway, culminating in World War I.

Realism makes several key assumptions. It assumes that the international system is anarchic, in the sense that there is no authority above states capable of regulating their interactions; states must arrive at relations with other states on their own, rather than it being dictated to them by some higher controlling entity (that is, no true authoritative world government exists). It also assumes that sovereign states, rather than international institutions, non-governmental organizations, or multinational corporations, are the primary actors in international affairs. According to realism, each state is a rational actor that always acts towards its own self-interest, and the primary goal of each state is to ensure its own security. Realism holds that in pursuit of that security, states will attempt to amass resources, and that relations between states are determined by their relative level of power. That level of power is in turn determined by the state's capabilities, both military and economic. Moreover, Realists believe that States are inherently aggressive (“offensive realism”), and that territorial expansion is only constrained by opposing power(s). The principal Realist theorists are Carr, Morgenthau, and Waltz.

There are two sub-schools of realism: maximal realism and minimal realism. The theory of maximal realism holds that the most desirable position to be in is that of the hegemon, the most powerful entity in the world, and that smaller entities will align themselves with the hegemon out of political self-interests. Under maximal realism, the position where there are simultaneously two equally powerful co-hegemons (such as was the case during the Cold War between the United States and the Soviet Union) is an inherently unstable one and that situation will inevitably collapse into a more stable state where one nation is more powerful and one is less powerful.

The theory of minimal realism holds that non-hegemonic states will ally against the hegemon in order to prevent their own interests from being subsumed by the hegemon's interests. Under the minimal-realism theory it is possible to have two equally powerful co-hegemons with whom a smaller entity may ally in turn depending on which hegemon better fits with the smaller entity's policies at the moment (playing both sides against the middle).