Populism, that old phenomenon resurfaced with unusual strength and extension in our times, makes understandable the profusion of works that come to light with the purpose of understanding the complex and problematic relationship that this trend has with democracy. This collective work is located within this framework, which has brought together prominent scholars on the subject, who from various theoretical and methodological perspectives discuss decisive questions such as: Is populism a terminal threat to the health and stability of representative institutions? Or, on the contrary, is populism a possibility of expanding and deepening our faded democratic regimes? Why does populism turn out to be a confusing, controversial, polysemous and, above all, disputed notion? With everything that has been researched and said about populism, do we have a theoretical construction that reveals the essential components of the anatomy of said phenomenon? Is populism a cause or a symptom of the anti-political abuse that has led to the imposition of a democracy without demos, of institutional practices of collective decision-making based on a government of experts? These and other questions of similar importance and importance structure the works that make up this work. The conjunction of views, its relevance and pertinence, is aimed at contributing to the understanding of diagnoses and proposed solutions to populism.