  The longstanding discrepancy between the measured and the predicted values of
the anomalous magnetic moment of the muon, $a_\mu = (g-2)/2$, is one of the
most intriguing potential hints of new physics in particle physics. After a
brief introduction, the status of the theoretical prediction of g-2 is
presented, with some focus on the contributions yielding the dominant
uncertainties. The status of the comparison with the experimental measurement
is then discussed.
