  We review the experimental progress on the study of light and heavy hadrons
and focus on recent discoveries of the XYZ states, pentaquark states, $T_{cs}$
and $T_{cc}$ states in the heavy hadron sector, and on the $\pi_1(1600)$ and
the states close to the $p\bar{p}$ threshold in the light hadron sector. The
observations suggest that we did observe hadronic molecules and we also
observed hadronic states with some other quark configurations.
