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.