  The strange quark plays a unique role in QCD, reflecting its intermediate
mass between the light and heavy quarks. In recent years, remarkable progress
has been made in the spectroscopy of baryons with strangeness. Many new
features of the strange baryon spectrum have been revealed by accurate
experimental data with novel techniques, as well as systematic developments of
theoretical framework to describe hadron resonances. The basic properties of
strange baryons, namely, the pole positions, spin and parity, and decay
branching ratios, are being determined accurately. As a consequence, the
Particle Data Group have added new entries in the particle listings, such as
the $\Lambda(1380)$ and the $\Omega(2012)$. The developments of the
spectroscopy stimulate intensive discussion on the exotic internal structure of
strange baryons beyond the ordinary three-quark configuration. In this review,
we introduce the basics of QCD, the scattering theory, and the exotic internal
structure of hadrons, emphasizing the importance of the pole positions of the
scattering amplitude for the characterization of hadron resonances. We then
summarize the current status of selected strange baryon resonances;
$\Lambda(1405)$, $\Lambda(1670)$, $\Xi(1620)$, $\Xi(1690)$, and $\Omega(2012)$,
from theoretical and experimental viewpoints.
