Dust is a key component of the Universe, especially regarding galaxies evolution, playing an essential role for both the physics and chemistry of the interstellar medium. In this paper, we give a brief review of interstellar dust. We describe the main dust observables and how it allows us to constrain dust properties. We discuss the dust lifecycle and the dust evolution in the ISM. We also present a physical dust model, DustEM.Comment: 15 pages, 5 figures, "The Dynamic ISM: A Celebration of the Canadian Galactic Plane Survey", ASP Conference Series, Vol.438, from a conference held in Naramata, BC in June 201
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