Populism is a political orientation or style that frames politics as a struggle between an authentic, virtuous “the people” and a corrupt or self-serving elite. The term is applied both descriptively, to movements and leaders that mobilize mass constituencies against established power, and analytically, to a thin-centered ideology that can attach to broader ideological programs across the left-right spectrum. What populism is, whether it is best understood as an ideology, a discursive style, a political strategy, or a form of mobilization, is itself contested; see populism-definition-debate and populism-ideology-or-style-viewpoint-debate.

Scholarly study of populism expanded significantly from the 1990s onward, accelerating after the electoral successes of populist-identified movements in Europe, Latin America, and North America in the 2010s. Comparative researchers generally recognize two broad genealogies: a Latin American tradition associated with redistributive, state-centered movements (Peronism in Argentina, chavismo in Venezuela) and a European tradition more often associated with right-wing nativist parties (the French Rassemblement National, Hungary's Fidesz). Both traditions share the people-versus-elite frame while differing substantially on who counts as “the people” and who counts as “the elite.”

The ideational approach, developed most prominently by Cas Mudde and Cristóbal Rovira Kaltwasser, treats populism as a thin ideology-one that lacks a full programmatic content of its own and therefore attaches to host ideologies such as socialism, nationalism, or agrarianism. The discursive or strategic approaches, associated with scholars such as Ernesto Laclau and Kurt Weyland respectively, emphasize rhetorical practice and organizational method over ideological content. These frameworks produce different empirical classifications: leaders and movements coded as populist under one framework may not qualify under another. See populism-definition-debate.

Research finds that populist appeals tend to intensify during periods of perceived institutional failure, economic dislocation, or perceived cultural displacement. Whether populism strengthens or weakens democratic institutions is an active area of empirical and normative debate; see populism-democracy-debate.

A range of evaluative and analytical viewpoints on populism circulates in scholarly, journalistic, and political discourse.

Populism as democratic corrective. Some analysts argue that populist movements perform a legitimate democratic function by re-enfranchising constituencies that mainstream parties have neglected and by challenging elite capture of political institutions. See populism-democratic-corrective-viewpoint.

Populism as threat to liberal democracy. Others contend that populism, by positing a homogeneous “real people” whose will should prevail without institutional check, erodes minority rights, judicial independence, press freedom, and other features of constitutional democracy. See populism-democratic-threat-viewpoint.

Populism as symptom, not cause. A third position holds that populist movements are better understood as indicators of prior democratic failure-rising inequality, unresponsive elites, or legitimate grievances unaddressed by mainstream parties-rather than as independent causes of democratic decline. See populism-symptom-viewpoint.

Left and right populism as categorically distinct. Some scholars and political actors argue that left populism (oriented against economic elites) and right populism (oriented against cultural or ethnic out-groups) differ so substantially in content and consequence that treating them under a single category obscures more than it reveals. See populism-left-right-distinction-viewpoint.

Populism as elite label. A minority scholarly position and a common populist self-defense hold that the “populism” label is itself a term of elite delegitimization, deployed to discredit majoritarian demands without engaging their substance. See populism-elite-label-viewpoint.

Defining the people. The question of which groups populist movements include in or exclude from “the people”-and the consequences for ethnic and religious minorities-has generated documented disputes in multiple national contexts. See populism-defining-the-people-controversy.

Populism and democratic backsliding. Political scientists dispute the causal weight of populist governance in documented cases of democratic erosion in Hungary, Venezuela, Turkey, and elsewhere, with contested evidence about direction of causality. See populism-democratic-backsliding-controversy.

Media and populist amplification. Scholars and journalists have documented disputes over whether mainstream and social media coverage amplifies populist messaging disproportionately, and what obligations, if any, follow for editorial practice. See populism-media-amplification-controversy.

• populism-history - History of populist movements
• populism-definition-debate - Debate: ideology, style, or strategy?
• populism-democracy-debate - Debate: does populism strengthen or weaken democracy?
• populism-left-right-distinction-viewpoint-debate - Viewpoint Debate: left vs. right populism as distinct phenomena
• populism-ideology-or-style-viewpoint-debate - Viewpoint Debate: thin ideology vs. discursive style
• populism-democratic-corrective-viewpoint - Viewpoint: populism as democratic corrective
• populism-democratic-threat-viewpoint - Viewpoint: populism as threat to liberal democracy
• populism-symptom-viewpoint - Viewpoint: populism as symptom of democratic failure
• populism-left-right-distinction-viewpoint - Viewpoint: left and right populism as categorically distinct
• populism-elite-label-viewpoint - Viewpoint: “populism” as elite delegitimization
• populism-defining-the-people-controversy - Controversy: defining the people
• populism-democratic-backsliding-controversy - Controversy: populism and democratic backsliding
• populism-media-amplification-controversy - Controversy: media amplification of populist messaging
• Democracy - Main Topic: Democracy
• nationalism - Main Topic: Nationalism
• political-polarization - Main Topic: Political Polarization

1. Cas Mudde and Cristóbal Rovira Kaltwasser, Populism: A Very Short Introduction (Oxford: Oxford University Press, 2017). 2. Ernesto Laclau, On Populist Reason (London: Verso, 2005). 3. Kurt Weyland, “Clarifying a Contested Concept: Populism in the Study of Latin American Politics,” Comparative Politics 34, no. 1 (2001): 1-22. 4. Jan-Werner Müller, What Is Populism? (Philadelphia: University of Pennsylvania Press, 2016). 5. Pippa Norris and Ronald Inglehart, Cultural Backlash: Trump, Brexit, and Authoritarian Populism (Cambridge: Cambridge University Press, 2019). 6. Steven Levitsky and Lucan Way, “The Myth of Democratic Recession,” Journal of Democracy 26, no. 1 (2015): 45-58. 7. Federico Finchelstein, From Fascism to Populism in History (Oakland: University of California Press, 2017).