Charmonium spectroscopy and decays

In this talk, I review the recent experimental developments on charmonium. These mainly include the precision measurements of spin-singlet states $\text{etac}$, $\text{etac}(2S)$, $h_c$, studies of the charmonium-like states X(3872) and the $Y$ states. Charmonium transitions and decays are also discussed.