Hadron spectroscopy and interactions from lattice QCD

Lattice QCD approach to study the hadronic resonances and exotic hadrons is described at an introductory level. The main challenge is that these states decay strongly via one or more decay channels, and they often lie near thersholds. Specific results for conventional and exotic hadrons are shown to illustrate the current status.Comment: 8 pages, invited talk at QCD@Work 27-30 June 2016 Martina Franca, Italy, some overlap with 1508.07322, reference added. arXiv admin note: text overlap with arXiv:1508.0732