  The LHCb and Belle collaborations have reported on some anomalies in $b \to
s$ transitions, with discrepancies with the Standard Model predictions in some
angular observables and branching ratios and intriguing hints for lepton
universality violation. We will review the current situation and explore the
proposed New Physics explanations for these tensions. We will also discuss the
possible connection of the $b \to s$ anomalies to other central problems in
physics, such as the dark matter of the Universe, the origin of neutrino masses
or the strong CP problem.
