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Dark matter remains one of the most compelling indications of new physics beyond the Standard Model. In this talk, I will present theoretical frameworks accommodating dark matter candidates, focusing on their dark matter phenomenology and how their signatures can be explored at collider experiments, alongside direct and indirect detection searches. I will place particular emphasis on extended scalar sectors as portals to the dark sector in the context of the Two Higgs Doublet Model and complex scalar singlet extension and highlight the discovery prospects at current and proposed future collider facilities.