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Internal shocks in blazar jets

The discovery of strong γ–ray and hard X–ray emission and the results from various multifrequency campaigns have disclosed new aspects of the blazar phenomenology, leading to a much more robust understanding of the mechanisms underlying their emission, and offering clues for the energetics of their relativistic jets. I review these aspects, and propose that all the diversity in the blazar phenomenology depends on only one parameter. I also suggest that some of the blazar characteristics can be explained by the internal shock scenario, as proposed to explain the emission from γ–ray bursts.