Hadron Spectroscopy and Interactions from Lattice QCD

The methods to precisely calculate the hadron spectroscopy and scattering amplitudes in lattice QCD is becoming mature in recent years. There has been a lot of progress in the implementation of these methods to study resonance properties. I review the new results in the last couple of years, with an emphasis on the exotic hadrons beyond the conventional quark model. The current challenges and future opportunities are also discussed.