Metallic compounds with a kagome lattice, made of corner-sharing triangles, are gaining increasing interest in condensed matter. This is due first to their unique non-trivial band structure, which encompasses Dirac crossing points, a flat band and Van-Hove singularities even at the simplest nearest-neighbor tight-binding approximation. Beyond electronic states with potentially non trivial topology, the recently discovered materials often also show signs of strong electronic correlations with magnetic ground states or even superconductivity. Thus, kagome metals provide a rare opportunity to combine strong correlations and topology to generate new quantum states.