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The interstellar medium is heated and ionised by radiation, by stellar winds, and by supernova explosions of massive stars. Stellar winds and supernova remnants (SNRs) form shocks with velocities of a few 100 to 1000 km/s and thus produce an interstellar cavity with a very low density, high temperature interior. Particles are accelerated in the shock front to energies of 100 TeV or higher. Multi-frequency studies of SNRs and superbubbles from radio to X-rays help to understand the the propagation of shock waves and their interaction with the ambient medium, while combining the study of interstellar shocks with that of GeV to TeV sources can improve our knowledge of the physics of interstellar shocks, the nature of the gamma-ray sources, and the origin of Galactic cosmic rays. I will give an overview of the studies of SNRs and superbubbles, present recent results, and discuss prospects for future studies, in particular with eROSITA.

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