Dark atoms and composite dark matter

I selectively review the theoretical properties and observational limits pertaining to dark atoms, as well as composite dark matter candidates bound by a confining gauge interaction: dark glueballs, glueballinos, mesons and baryons. Emphasis is given to cosmological, direct and indirect detection constraints.Comment: 49 pages, 27 figures. Lectures given at Les Houches Summer School 2021: Dark Matter. v2: added references; v3: fixed spelling of Montr\'eal; v4: corrections and improvements following referee report