High-energy Neutrino Astronomy: The Cosmic Ray Connection delves into one of the most dynamic and challenging frontiers of modern astrophysics. This field seeks to unravel the mysteries of the most extreme environments in the universe—such as supermassive black holes, gamma-ray bursts, and supernova remnants—by detecting the high-energy neutrinos they produce. Unlike charged cosmic rays, which are deflected by magnetic fields, neutrinos are neutral, ghost-like particles that travel in straight lines from their sources, acting as unique and unambiguous cosmic messengers. This text explores the intrinsic link between these neutrinos and the origins of ultra-high-energy cosmic rays, arguing that detecting neutrinos is the key to finally identifying the powerful cosmic accelerators that have eluded scientists for a century. It covers the monumental detector technologies, like IceCube and KM3NeT, and the theoretical models that are paving the way for this new form of astronomy, offering a clear window into the violent universe.

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