  We review the current-generation short-baseline reactor neutrino experiments
that have firmly established the third neutrino mixing angle $\theta_{13}$ to
be non-zero. The relative large value of $\theta_{13}$ (around 9$^\circ$) has
opened many new and exciting opportunities for future neutrino experiments.
Daya Bay experiment with the first measurement of $\Delta m^2_{ee}$ is aiming
for a precision measurement of this atmospheric mass-squared splitting with a
comparable precision as $\Delta m^2_{\mu\mu}$ from accelerator muon neutrino
experiments. JUNO, a next-generation reactor neutrino experiment, is targeting
to determine the neutrino mass hierarchy with medium baselines ($\sim$50 km).
Beside these {\color{black} opportunities enabled by the large $\theta_{13}$},
the current-generation (Daya Bay, Double Chooz, and RENO) and the
next-generation (JUNO, RENO-50, and PROSPECT) reactor experiments, with their
unprecedented statistics, are also leading the precision era of the 3-flavor
neutrino oscillation physics as well as constraining new physics beyond the
neutrino Standard Model.
