Zoom Recording

In the past decade, the γ-ray sky has been revealed by the Fermi Large Area Telescope (LAT), offering an outstanding picture of our Universe at the highest energies. A big portion of this γ-ray emission has been resolved, studied and attributed to known astrophysical objects and physical processes. The remaining component -- the Unresolved Gamma-Ray Background (UGRB)-- represents the only available information about the sources of gamma rays (astrophysical or more exotic, like dark matter) that are too faint to be detected individually. In this colloquium I will present the main analysis techniques used to assess the origin of the UGRB through its statistical properties. I will review some of the most recent results and provide some future perspectives on the topic.