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The state of debates around the topic of 'populism' has made clear the difficulties that exist to provide a coherent definition of the concept. There is much to be argued from historical, epistemological, comparative and sociological perspectives that may provide clarity to the uses of the term. As the world meets new scenarios of uncommon styles of doing politics and the themes of ideological polarization and social segregation take hold, the question about the value of 'populism' as a theoretical tool needs to be met with an affirmative stance that delineates its principal characteristics. The present text introduces the reader to four new perspectives that serve such a purpose and locates them among the relevant contemporary literature. [ABSTRACT FROM AUTHOR]