  The study of light hadrons is central to the understanding of confinement--a
unique property of QCD. The quark model describs mesons as bound states of
quarks and antiquarks. LQCD and QCD-motivated models for hadrons, however,
predict a richer spectrum of mesons that takes into account not only the quark
degrees of freedom but also the gluonic degrees of freedom. A selection of
recent progress in the light-quark sector with unprecedented high-statistics
data sets from $e^+e^-$ experiments are reviewed.
